Fundamental Rights and Limited Possibilities: The Proviso of the Possible in European Fundamental Rights Doctrine

Abstract Fundamental rights to positive state action are costly. An allocation in favor of one individual rightsholder always results in lower allocations in favor of others. The dominant approach in fundamental rights doctrine assumes these conflicts can be resolved judicially by balancing competing rights and other public needs. In practice, carrying out an in-depth balancing in resource allocation cases proves challenging but constitutional courts developed different strategies and concepts to deal with costly rights. The European Court of Human Rights applies a “wide” margin of appreciation and requires that positive state obligations do “not impose an impossible or disproportionate burden on the authorities.” Following the German Federal Constitutional Court, several constitutional courts have applied a concept known as the “proviso of the possible.” The proviso of the possible constrains positive rights and results in a wide margin of discretion granted to political authorities. This article attempts to investigate the specific meaning of the “proviso of the possible” in the context of European fundamental rights law by comparing it against alternative doctrinal concepts. The investigation aims to identify common legal principles and methods to deal with fundamental rights conflicts over scarce public resources.


A. Introduction
In 2014, the European Court of Human Rights (ECtHR) had to decide on Portuguese austerity measures.The applicant, Mrs Da Silva Carvalho Rico, was a pensioner whose pension was cut due to cost-cutting constraints.The ECtHR ruled that the pension cut did not violate the applicant's rights, namely the right to property laid down in Article 1 of Protocol No. 1 to the European Convention on Human Rights (ECHR).Within its judgment, the ECtHR accepted a legal concept that had previously been applied by the Portuguese Constitutional Court when dismissing the applicant's claim in the same case.The concept of the "proviso of the possible" was used as a limitation of her right. 1However, since then, the Da Silva Carvalho Rico judgment and its implicit recognition of the proviso of the possible have not received much attention. 2By accepting the application of the proviso of the possible, the ECtHR implies that the concept is compatible with its positive obligations doctrine. 3Nevertheless, it needs to be clarified whether the proviso of the possible and the ECtHR's doctrine express the same meaning in different terms or whether the proviso of the possible offers an alternative approach to a judicial review of rights in conflicts over limited public resources.These issues will become relevant once more.A German case involving applicants who complained about the lockdown of schools during the pandemic is pending before the ECtHR. 4In the challenged ruling, the German Federal Constitutional Court (FCC) recognized a positive right to educational services in the German Constitution but subjected it to the proviso of the possible. 5In the 1970s, the FCC became the first court to use the proviso of the possible ("Vorbehalt des Möglichen"). 6Since then, constitutional courts and legal scholars worldwide have taken up the concept.
As allocative conflicts and the necessity to fulfill positive rights obligations concern all European states, a broader consensus about how to deal with these conflicts is desirable.At first sight, the existing doctrinal formulas and concepts appear to have more in common than has been noticed so far.This article attempts to investigate the hitherto vague formula of the proviso of the possible by comparing it against similar doctrines of resource constraints and feasibility conditions.In particular, the proviso of the possible shall be contrasted against doctrinal concepts used by the ECtHR, such as the "Osman test" and the margin of appreciation doctrine.The thesis to be tested is that the proviso of the possible partially overlaps with these concepts.Granting a particularly wide margin of discretion to political authorities in distributive conflicts is a result of applying the proviso of the possible.Both the proviso of the possible and the ECtHR's margin of appreciation doctrine widely subject positive rights claims to political decision-making.The courts do not carry out an in-depth balancing of costly rights; they only exclude minimum rights from the application of resource constraints.
The investigation starts with a comparison of constitutional jurisprudence dealing with fundamental rights conflicts over public resources (B).The comparative study will cover German and Italian constitutional law as well as the case law of the ECtHR.Based on the findings, the investigation aims to develop common principles for a European fundamental rights doctrine and their integration into a theoretically grounded "model of the proviso of the possible" (C). 7This inquiry will consider why the established standards of judicial review, such as the proportionality test and the balancing formula, fail to resolve complex distributive conflicts judicially.The phenomenon of constitutional courts applying the proviso of the possible could be a result of this failure and indicate the limits of adjudication and positive rights constitutionalism. 8The proviso of the possible also implies a certain understanding of the separation of powers and the legitimation of distributive decisions.

B. A Comparative Study: From Karlsruhe to Strasbourg
The proviso of the possible originates in German fundamental rights doctrine.It did not take long before the German "Vorbehalt des Möglichen" found its way into other jurisdictions.In particular, South American scholars developed a keen interest in the concept of the proviso of the possible, which nowadays is an integral part of their fundamental rights doctrine. 9In European jurisdictions, the proviso of the possible has been adopted by courts and scholars as the "réserve du possible" (France), 10 the "riserva del possibile" (Italy), 11 the "reserva de lo posible" (Spain), 12 the "επιφύλαξη του εφικτού" (Greece), 13 andas already mentionedas the Portuguese "reserva do possível." 14German and Italian constitutional jurisprudence as well as the case law of the ECtHR were selected for the following comparative study.
I. The "Vorbehalt des Möglichen" in German Constitutional Law In the 1970s, the German Federal Constitutional Court (FCC) had to rule on constitutional complaints from applicants who had been rejected by universities.The judges stated that a right to access public higher education and be admitted to university could be part of the fundamental right to choose one's occupation pursuant to Article 12 of the German Basic Law (Grundgesetz).This was remarkable in that the Basic Law does not contain any explicit rights to state benefits but merely establishes the welfare state (Sozialstaat) as a goal of state policy.However, after having considered the recognition of a positive right to higher education, the judges noted that this right was subject to the "proviso of the possible" (Vorbehalt des Möglichen), "meaning that which the individual may reasonably claim from society."As a result of the proviso of the possible, the students could only effectively claim a fair and equal chance to participate in the capacities that already existed, but a substantive claim for greater capacity was rejected.The FCC further explained that it was the "primary responsibility" of the legislator to decide what one "may reasonably claim," taking into consideration "other welfare concerns as well as the demands of overall economic balance." 15The Court later applied the proviso of the possible to other areas of state benefits, such as financial support for private schools 16 and families. 17In these cases, applying the proviso resulted in a limitation of positive rights (Leistungsrechte) and the dismissal of the claims.Instead, the court only enforced procedural guarantees to equal participation in existing capacities (Teilhaberecht), which must be efficiently exhausted (Kapazitätserschöpfungsgebot).The court also recognized certain non-derogable minimum rights that are costly but not subjected to the proviso of the possible; for example, the Hartz IV ruling recognized the right to the guarantee of a subsistence minimum 19 and a series of decisions granting civil servants the right to an appropriate remuneration (amtsangemessene Besoldung). 20Regarding both rights, the FCC applied a procedural approach requiring the legislator to set up a consistent calculation mechanism for the respective benefits.However, recognition of these non-derogable minimum rights has always been of an exceptional nature.The Court has not given up its restrained position regarding the recognition of positive rights and their limitation by the proviso of the possible.The FCC recently decided on the constitutionality of the federal government's nationwide lockdown measures during the pandemic.The federal law, named "Bundesnotbremse," provided for the closure of schools. 21In its Bundesnotbremse II ruling, the Court recognized a "right to school education" under Articles 2 and 7 of the Basic Law.The Court stated that this right has both a negative and a positive dimension. 22As regards the positive dimension, the right entails an entitlement to educational services that enable the students to develop a self-determined personality. 23The Court subjected this entitlement to the proviso of the possible.The German judges stressed that this reservation does not exclusively apply if the provisioning of the desired educational benefits was factually impossible due to insurmountable resource constraints.The proviso of the possible also grants discretion to the legislator to decide "to what extent the available resources are to be used for the purposes of school education, taking into account other equally important state obligations." 24The Court, however, stressed that the proviso of the possible does not apply to the "minimum standard" of the right. 25rom the case law outlined above, we can derive the following conclusions.Apart from the right to equal participation, the requirement to effectively exhaust existing capacities and the recognition of minimum standards, the FCC subjects fundamental rights to state benefits to the proviso of the possible.This does not merely apply in cases of factual impossibility when the fulfillment of a right is completely unfeasible (proviso of the factually feasible).The FCC applies the proviso of the possible if the fulfillment of the claim of a fundamental right might be feasible but only at the expense of other fundamental rights and public interests.The FCC clearly assigns these distributive decisions to the democratic legislator who determines, politically, what the state should make possible (proviso of the politically possible).This is what interpreters have described as a "double function" of the proviso of the possible. 26pon a closer look, the FCC's case law lacks information on the scope of the proviso of the possible and its implications for fundamental rights review.If the proviso of the possible demands "judicial self-restraint" from a constitutional court, 27    court is supposed to restrain itselfand to what extent it might review costly rights.Former FCC judge Dieter Grimm once suggested that the proviso of the possible results in an "inverse proportionality test," raising the question of "whether the state can reasonably be expected to fulfill its protective duty taking into account other basic rights." 28However, an analysis of the jurisprudence reveals that the court avoids carrying out a comprehensive proportionality test in positive rights cases.In Bundesnotbremse II, the court expressly stated that the application of the proportionality test was to be reserved for negative rights. 29ince the FCC introduced the proviso of the possible into its case law, the term became subject to different interpretations by German constitutional scholars.Even though it is an often-used argument, substantial contributions to its implications remain rare. 30The few examples of deeper engagement conceive the term as a meta principle rather than as concrete guidance on legal decision-making.Erhard Denninger, for instance, characterized the proviso of the possible as a "key term of constitutional law," marking an "economic-political limitation" to state obligations, thereby regulating the tension between individual and collective needs. 31ürgen Habermas regarded the proviso of the possible from a critical perspective as a "functional imperative" that would only support the conservation of the existing order. 32This critique opposes a conservative reading of the proviso of the possible represented by German legal scholars such as Josef Isensee and former FCC judge Paul Kirchhof.From their perspective, which appears to have been inspired by Carl Schmitt's legal theory of Concrete-Order Thinking (Konkretes Ordnungsdenken) 33 , the proviso of the possible is a warning against extensive demands on the state and the loss of the state's proper functioning.These scholars used the proviso of the possible as a major argument against an increase in state debt and migration, which could impose impossible burdens on public authorities. 34Following Schmitt's remark that "the state can only distribute what it has taken from others," 35 German constitutional scholars frequently pointed out that fulfilling positive rights always presupposes an encroachment on taxpayers' rights, which requires justification. 36

II. The Proviso of the Possible under European Constitutions with Social Rights
In contrast to the German Basic Law, other European constitutions contain explicit social rights to certain state benefits. 37Since the provision of constitutionally guaranteed goods such as health care, education, and housing is costly, constitutional courts in their respective countries have often been confronted with distributive conflicts, and some adopted the proviso of the possible to  MÖGLICHEN (2000).react to them.The Portuguese Tribunal Constitucional interprets the social rights of the Constitution of 1976 primarily as legislative goals subject to the "reserva do possível" in terms of political, economic, and social possibilities. 38Regarding the realization and concretization of the rights, the legislator generally enjoys a broad margin of discretion (larga margem na realização ou conformação).Only an "essential core" (núcleo essencial) is precluded from the application of the proviso of the possible. 39 closer look at Italy reveals that Italian constitutional jurisprudence discovered the German proviso of the possible in the 1980s.Antonio Baldassarre introduced the concept to Italian constitutional law doctrine as the "riserva del possibile e del ragionevole" (proviso of the possible and reasonable), 40 thereby pointing out that positive rights are not only conditioned by the factual possibilities of a community but also by its political decisions on the "reasonableness" of individual claims to state benefits.Since then, the "riserva del possibile e del ragionevole" has been recognized as a general principle of Italian fundamental rights doctrine. 41The Corte Costituzionale, even though it never explicitly used the term, applies principles similar to those extracted from the case law of the FCC.Commentators on Italian jurisprudence interpreted these principles as recognizing the "riserva del possibile e del ragionevole." 42In a key ruling concerning the right to health laid down in Article 32 of the Italian Constitution, the Corte Costituzionale stated: This right is conditioned by the way the legislature chooses to implement it, balancing the interest it protects against other constitutionally protected interests and also considering the objective limits it encounters in doing so (e.g., the organizational and financial resources available at the time).
The Court further held that this "principle" was "common to every other constitutional right imposing a positive obligation on the State." 43Therefore, the state authorities are only required to fulfill the positive rights "gradually" (principle of gradualità) depending on the availability of resources. 44The social rights of the Italian constitution only provide whether and that (an e quid) the state is obliged to act, not how and when (quomodo e quando). 45Like the German FCC, the 38 T.C., Decision No. 131/1992 (1 April 1992).In the early decisions, the court expressively quoted the German "Vorbehalt des Möglichen", thereby disclosing its origin.39 T.C., Decision No. 400/2011 (22 September 2011).The court imposed limits on the cutting of pensions, ruling that the pension must still ensure a "social minimum" (mínimo social) with respect to the principle of human dignity: Italian court exempts a minimum core (nucleo irreducibile) from being subjected to the proviso of the possible: [ : : : ] the protection of the right to health is subject to the limitations and constraints arising from limited financial resources; [ : : : ] however, [ : : : ] the balancing discretion granted to the legislature may not assume 'such a weight preponderant as to violate the irreducible core of that right, protected by the Constitution as an inviolable sphere of the human personality.' 46though the Corte Costituzionale mentions the necessary balancing of the public interest and social rights as part of the budgetary decision-making process, it never carried out a strict proportionality test on the social rights of the Constitution.Instead, the Court focused on enforcing minimum rights, as did the German FCC.The court ruled that basic levels of social assistance (livelli essenziali di assistenza), if specified by the legislator, must be fulfilled and cannot be refused due to broad reductions in public spending. 47A definite state obligation in secondary legislation is no longer subject to budgetary discretion.In these cases, the proviso of the possible does not apply. 48The regional authorities responsible for providing the benefits must be sufficiently funded to carry out their legal obligations. 49In recent years, the Corte Costituzionale has specified several core rights, including the right to access educational services for people with disabilities.Pursuant to the Court's rulings, the state must provide these students with the necessary teaching, transport, and assistance. 50This minimum standard must be provided and "financed in any case and cannot depend on financial choices." 51Critical commentators have observed that the court's definitions of minimum rights often remained vague and inconsistent. 52thers have pointed to the idiosyncrasies of different rights and state sectors that require each minimal core to be determined individually. 53he Corte Costituzionale also established procedural hurdles to austerity measures.Due to the state debt crisis, the legislature suspended an automatic increase mechanism for certain pensions.In 2015, the Court ruled that the law interfered with the right to adequate social security rooted in Articles 36 and 38 of the Constitution and could not solely be grounded on the "contingent financial situation" but had to be justified in detail. 54The principle of a balanced budget, laid down in Article 81 of the Italian Constitution, while being recognized as a legitimate public interest and a limitation to constitutional rights, is not a "winner-take-all principle." 55Even though critics have pointed to the potential cost burden of the ruling, 56 the decision does not deviate fundamentally from the settled case law and its implicit recognition of the proviso of the possible.The Court established a mere procedural duty to give reasons when deviating from an objective and consistent mechanism that is supposed to ensure that pensions are aligned with increases in the cost of living.This approach resembles the procedural review applied by the FCC to certain positive rights.The Corte Costituzionale later confirmed the constitutionality of the adapted law, also considering the "wide margin of appreciation" recognized by the ECtHR. 57he Italian "riserva del possibile" broadly overlaps with the German "Vorbehalt des Möglichen."In both jurisdictions, the proviso of the possible becomes relevant if a constitutional right is costly and its fulfillment depends on factual possibilities.Its application results in a limitation of the right relative to the factual feasibility as well as to political preferences.Both constitutional courts grant the legislator wide discretion when scarce public resources are at stake, and multiple demands are in conflict.The legislator's assessment is not subject to a structured proportionality review and strict judicial balancing.Instead, the constitutional courts enforce equality rights to prevent discrimination with respect to the distribution of scarce goods.The courts apply a narrower margin of discretion and stricter scrutiny if the legislator violates legitimate trust in the continuity and consistency of existing benefit schemes.In exceptional cases, the courts adjudicate minimum rights against which the proviso of the possible cannot be invoked.These common principles are now contrasted against the positive obligations doctrine applied by the ECtHR in similar cases.

III. The ECtHR's Positive Obligations Doctrine and Resource Constraints
The ECtHR recognizes that the rights of the ECHR correspond with positive state obligations, distinguishing between procedural and substantive obligations. 58In particular, substantive obligations can significantly impact state budgets and require public resources.In the Belgium Linguistic Case, the Court, for the first time, acknowledged this positive dimension of the Convention rights.The applicants were French-speaking parents demanding that their children be taught in their mother tongue.The Court stated: The right to education [ : : : ] calls for regulation by the State, regulation which may vary in time and place according to the needs and resources of the community and of individuals.
[ : : : ] such regulation must never injure the substance of the right to education nor conflict with other rights enshrined in the Convention.[ : : : ] The Convention therefore implies a just balance between the protection of the general interest of the Community and the respect due to fundamental human rights while attaching particular importance to the latter. 59is passage contains statements reminiscent of those above with the proviso of the possible.The Court addressed the distributive conflict over scarce resources and the tension between the individual and the public interest.It also mentioned the necessity of striking a fair balance and the inviolability of a "substance of the right."Since then, the court has developed different formulas and approaches to assess positive state obligations.In some cases, the court applies an "even wider" margin of appreciation due to the scarcity of resources (1).In other cases, the court interpreted the right "in a way which does not impose an impossible or disproportionate burden on the authorities" (2).However, the Court does not restrain from reviewing distributive decisions.For example, the court reviews benefits schemes with regard to discrimination in violation of Article 14 ECHR (3).The court differs between a "substantive aspect" and a "procedural aspect": Öneryildiz v.

The "Even Wider" Margin of Appreciation
With respect to the fulfillment of the rights of the Convention, through its margin of appreciation doctrine, the ECtHR grants discretion to legislators and other public authorities.Given the pluralism of values among the Contracting States, reaching a consensus is an ambitious task.The ECtHR can only strive for an effective protection of certain minimum standards.By granting a margin of appreciation, the Court respects the plurality of values and refrains from taking the final decision. 60Due to their "direct democratic legitimation," the Court sees the national authorities as "better placed" to "assess priorities, use of resources and social needs." 61Beyond these considerations of legitimacy, the margin of appreciation doctrine reflects the Convention's indeterminacy and textual openness, which requires interpretation and specification like most constitutional legal texts. 62Depending on the individual case, the ECtHR adjusts the width of the margin of appreciation.A narrow margin of appreciation results in strict scrutiny, often carried out through a proportionality review, while a wider margin of appreciation usually means that the court refrains from an in-depth assessment. 63This flexible use of the margin of appreciation also affects the court's assessment of positive state obligations.
In Abdulaziz, the Court first held that "as far as those positive obligations are concerned [ : : : ] the Contracting Parties enjoy a wide margin of appreciation in determining the steps to be taken to ensure compliance with the Convention with due regard to the needs and resources of the community and of individuals." 64Later, in O'Reilley, the Court stated that the margin of appreciation "is even wider when the issues involve an assessment of the priorities as to the allocation of limited State resources." 65The Court thereby recognized the availability and scarcity of resources as a decisive criterion for adapting its margin of appreciation.Most of the quoted formula's decisions concern "general measures of economic or social policy." 66In HUC, Pentiacova, McDonald, and Sentges, the claimants invoked the right to private life (Article 8 ECHR) with respect to health and demanded funding of costly therapies, treatments, and other benefits.In O'Reilley, the applicants complained about the lack of maintenance of the public roads in their county, which impaired their private lives.Abdulaziz, Cabales, Balkandali, Tanko, and Dreshaj were immigrants invoking their right to respect for family life against refusals of family reunifications and expulsions (Article 8 ECHR).In Koufaki and Da Silva Carvalho Rico, the claimants contested austerity measures that reduced their salaries and pensions, relying on their right to property under Article 1 of Protocol No. 1 to the Convention.The aforementioned rulings have in common that the legislators made crucial distributive decisions concerning the claimants' rights on a macro level.Although the Court always points to the requirement of a "fair balance that has to be struck between the competing interests of the individual and of the community as a whole," 67  has been met.Rather, the ECtHR respects the "State's freedom to decide whether or not to have any form of social-security scheme in place, or to choose the type or amount of benefits to provide under any such scheme." 68Consequently, the Court does not carry out a fully-fledged proportionality review when it applies the wide margin of appreciation to allocative cases.In some of the cases, the Court did not enter into a proportionality test at all, dismissing the claims beforehand on grounds of inadmissibility. 69In Pentiacova, the Court found the claim manifestly ill-founded, considering "that the applicants' claim amounts to a call on public funds which, in view of the scarce resources, would have to be diverted from other worthy needs funded by the taxpayer."Similarly, in Sentges, the Court ruled the application inadmissible since the national authorities would be "in a better position to carry out [ : : : ] an assessment of the priorities in the context of the allocation of limited State resources".In McDonald, the court addressed the proportionality of the non-fulfillment of a positive obligation but expressed, without a further assessment, that it was "satisfied that the national courts adequately balanced the applicant's personal interests against the more general interest."This "satisfaction" was not based on comprehensive judicial balancing.Instead, the court explicitly restrained from substituting "its own assessment" for the political assessment of the authorities, "notably in relation to the allocation of scarce resources." 70By respecting the legislator's assessment within its margin of appreciation "unless" it "is manifestly without reasonable foundation," 71 the ECtHR shifts the burden of justification and establishes a general presumption of reasonableness that can only be refuted if a distributive decision is evidently imbalanced.
Commentators noted that the concept of the margin of appreciation generally "lacks any normative force" as it does not indicate how to "strike a balance between individual rights and public interest." 72The Court simply decides "not to intervene." 73In relation to the cases investigated above, these observations apply.Even though the Court requires that the right is not deprived "of its substance," 74 it has adjudicated concrete minimum obligations only in exceptional cases, particularly when high-ranking rights were concerned.For instance, the ECtHR defined the minimum living space for a detainee in prison. 75The Court emphasized that states are obliged to fulfill these requirements "regardless of financial or logistical difficulties." 76Consequently, the "wide" margin of appreciation ends where the "substance" of rights begins.This complementary relationship coincides with the one between the proviso of the possible and minimum rights under German and Italian constitutional law.

The Osman Test
In Osman, the ECtHR assumed a positive state obligation to take preventive measures to protect an individual whose life is at risk from the acts of another individual.The complaint was directed at an alleged failure by the police to prevent the murder and injury of two members of the Osman family.Investigating the scope of the state's protective duty under Article 2 ECHR, the Court considered the following: [B]earing in mind the difficulties involved in policing modern societies, the unpredictability of human conduct, and the operational choices which must be made in terms of priorities and resources, such an obligation must be interpreted in a way which does not impose an impossible or disproportionate burden on the authorities. 77is formula became part of the settled case law of the Court and is known as the "Osman test."Pursuant to this test, a violation of the right to life guaranteed by Article 2 ECHR is only assumed if the authorities knew of a risk and "failed to take measures within the scope of their powers." 78he cases in which the court relied on the formula concerned complaints about non-action by state police authorities and other local administrative bodies in situations where they were responsible for protecting the right to life. 79Similar principles were applied when other convention rights required protective measures.In Plattform Ärzte für das Leben, the court held that Article 11 ECHR implies a positive state obligation "to take reasonable and appropriate measures to enable lawful demonstrations."The ECtHR, however, limited the obligation to the extent that the state "cannot guarantee this absolutely" and granted the police forces "a wide discretion in the choice of the means to be used." 80here are similarities and linkages between the Osman test and the "even wider" margin of appreciation, as both respect the difficulties public authorities encounter when making use of limited resources.In Öneryildiz, the Court, referring to Osman, accepted the "argument that in this respect an impossible or disproportionate burden must not be imposed on the authorities" and explained that "this results from the wide margin of appreciation States enjoy [ : : : ] in difficult social and technical spheres." 81However, the Court's scrutiny in Osman and the cases named in the preceding paragraph has been stricter.The reason for the different treatment of the cases could be a matter of perspective.In Osman and most of the other cases where the "Osman test" reappeared, the ECtHR primarily focused its review at the micro level of a certain administrative body and the question of whether it could have acted differently to safeguard a Convention right, taking into consideration the available resources, in particular, the "knowledge" of the relevant authority. 82Under the Osman test, it is not necessary to question the allocation of resources at the macro level.Even if the rulings concluded the authorities could have done more to protect the right, the potential cost of the respective measures was limited to the case. 83The Court could find that the failure to act was due to organizational failure and the inefficient use of the available resources. 84If the Court held the legislator liable for a failure to protect, it called for regulatory and organizational measures rather than for additional expenses and a reallocation of the overall budget. 85While the margin of appreciation primarily refers to the political latitude in prioritizing certain needs over others, the Osman Test addresses the factual feasibility of particular protective actions given the available resources in a specific situation.largely with the two functions of the proviso of the possible.The Osman test mirrors the proviso of the factually feasible, whereas the wide margin of appreciation mirrors the proviso of the politically possible.

Benefit Schemes and the Non-Discrimination Principle
On several occasions, the ECtHR reviewed whether the non-delivery of state benefits and services to certain groups violated Article 14 of the Convention prohibiting discrimination based on the "status" of a person.Since Stec and Others v UK, the Court ruled that if a state decides to create a benefits scheme, "it must do so in a manner which is compatible with Article 14." 86 This applies even where the Convention does not include a right to receive certain benefits.The right granted on the grounds of the prohibition of discrimination is, therefore, only of a participatory and derivative nature.Generally, its recognition depends on the legislator upholding the respective benefits scheme.If the legislator decided to abolish the scheme for everyone, the participatory right would also lose recognition.Consequently, if the ECtHR rules that a benefits scheme is discriminatory and violates Article 14, the Contracting State can rectify the violation either by extending the benefit to the discriminated group ("levelling up") or by abolishing the benefits scheme altogether ("levelling down"). 87

IV. Conclusion of the Comparative Study
The comparison of the proviso of the possible as applied in Germany and Italy and the ECtHR's positive obligations doctrine showed that national constitutional courts and the ECtHR apply similar principles when the rights under review depend on the availability of public resources.The duty to use the available resources efficiently for the fulfillment of rights and the principle of non-discrimination, which results in a derivative right to participate in existing benefit schemes, are recognized in all jurisdictions.To this extent, the scope of the rights cannot be restricted due to resource scarcity.Beyond that, the courts acknowledge minimum rights as non-derogable and preclude them from resource constraints.The concept of a "wide" margin of appreciation and the proviso of the possible address the relationship between individual and collective needs. 88Courts use these concepts to respect the prerogative role of politics in deciding allocative conflicts.Against the backdrop of this broad doctrinal overlap, it is not surprising that the ECtHR accepted the application of the proviso of the possible by the Portuguese Constitutional Court.Nevertheless, the Court did not consider it necessary to adapt its own doctrine.The proviso of the possible has not occurred in the court's case law ever since.It remains to be seen whether the ECtHR will come back to it again when deciding on the pending application against German school lockdowns.Although the comparison did not reveal significant differences in legal practice, the question arises whether there are common principles underlying the different doctrinal terminology.While the ECtHR maintains diverging terms and formulas to deal with rights conflicts over scarce resources, the proviso of the possible functions as a general and overarching "key term"89 to moderate such conflicts.For that reason, the proviso of the possible is an appropriate headline for theoretical considerations on the general "idea of resource constraints as limiting rights." 90The following inquiry intends to integrate the identified common legal concepts of European fundamental rights law into a comprehensive model of the proviso of the possible.

C. A Theoretical Inquiry of the Proviso of the Possible
The findings from the comparison of jurisprudence between European courts raise questions in different fields of legal theory.A theoretical model of the proviso of the possible, which can be expected to work in legal practice, should answer these questions. 91he first and most general question concerns the tension between norms and facts.The proviso of the possible and similar concepts of "feasibility conditions" 92 challenge the legal validity of constitutional norms.Putting the validity of the law into question when legal duties cannot be fulfilled is not a novel phenomenon.It resulted in the formulation of principles like "Ought implies can," 93 "impossibilium nulla obligatio est," 94 or "ultra posse nemo obligatur". 95,96Pursuant to these principles, impossible obligations are invalid.Human rights scholars such as Maurice Cranston argued against positive rights, stating that they can never be rights if they are impossible to fulfill. 97Of course, if legal norms are completely unattainable, it is "senseless" to uphold their validity. 98However, it will rarely be proven with absolute certainty that a legal norm is unfeasible for all time.As long as a slight opportunity of feasibility remains, any legal norm transports an "assumption of possibility" and thereby sets a "realization marker." 99Any norm functions as a goal for approximation, making the addressee "act in such a way that the description of the real approximates the description of the ideal." 100 This understanding of norms as goals for approximation should be reflected in a differentiated theory of the structure of legal norms.Robert Alexy's "rule-principle" model offers an approach for acknowledging the proviso of the possible as a structural concept of law resulting from its textual openness (I).
The second question concerns the methodological limits of adjudication indicated in the jurisprudence of all courts in the comparative study.The courts investigate costly rights only up to a certain point.They particularly review whether the authorities used their available resources efficiently and whether they observed the principle of non-discrimination when distributing the resources to individual persons or groups.Minimum rights often remain a theoretical concept and have rarely been specified by constitutional courts.Beyond these standards of review, courts refrain from substituting the political evaluation of individual rights and public needs with their own judicial assessment.This is remarkable because, in theory, balancing as part of a structured proportionality test is still considered the key method for resolving all fundamental rights conflicts, including those over positive rights. 101The doctrine of legal balancing assumes that rights can be ranked due to the weight attached to them by the Constitution.However, ranking rights becomes an intricate task when multiple rights and public needs compete over limited resources (II).
The third question refers to the legitimacy of distributive decisions.Legitimacy is the essential precondition for making collectively binding decisions.Distributive decisions need a high level of legitimacy because they concern the democratic community as a whole.If a right is costly, the expenses must be borne by others who must pay taxes or renounce their individual needs.If fundamental rights norms have an open structure that requires concretization relative to the factual possibilities (I) and legal methods are limited in adjudicating allocative conflicts (II), it remains to be seen who is "better placed" to take the final decision.Decisions become inevitable when scarcity requires the state to choose between competing rights and public needs.From the comparative study, one could learn that courts see the legislator as primarily responsible for making those allocative decisions.Applying the proviso of the possible thus indicates a certain understanding of the separation of powers and democratic legitimacy (III).

I. The Normative Structure of Rights as Principles
Robert Alexy illustrated the normative structure of law in the rule-principle model.Regarding fundamental rights, this model differentiates between rights as principles and rights as rules. 102hile rules provide definite commands, principles are merely general goals.A right can be both a principle and a rule depending on the stage of its normative concretization in different contexts.While the abstract rights laid down in a constitutional text are principles, a court applying a certain right to a single case might derive a rule from it.Due to their textual and normative structure, rules and principles relate differently to the factual and legal possibilities.According to Alexy, "principles are norms which require that something be realized to the greatest extent possible given the legal and factual possibilities."Principles in this way command "optimization." 103Critics have argued against the understanding of rights as optimization requirements, which would mean recognizing unlimited "prima facie rights to everything." 104 However, optimization requirements are only a starting point for a transparent and comprehensive review of rights.The "ideal ought" does not have to be fulfilled in its entirety, only approximately. 105As it is impossible to achieve the optimums of competing principles simultaneously under the condition of limited factual possibilities, principles "always have a supervening character."The "concept of supervenience" means that, prima facie, principles may demand the impossible. 106When applied to a case, the principle's "ideal ought" must be transformed into a rule expressing the "real ought." 107In this process, principles are subjected to the proviso of the possible inherent in their normative structure. 108 limited even if their fulfillment is theoretically possible if the achievement of other individual rights or political aims takes priority and renders the (complete) fulfillment of the respective right relatively impossible.In contrast to principles, rules as definite commands are supposed to lie within the scope of the factually possible: [R]ules are norms which are always either fulfilled or not.If a rule validly applies, then the requirement is to do exactly what it says, neither more nor less.In this way rules contain fixed points in the field of the factually and legally possible. 109[ : : : ] This decision can run up against legal and factual impossibility, which can lead to the rule's invalidity. 110e absolute nature of rules precludes the invocation of relative impossibility.Only in rare cases of complete impossibility can they become invalid.If the addressee can act, it must act.However, since rules are derived from principles, applying the proviso of the possible to principles might prevent the establishment of impossible rules.If circumstances change and the factual possibilities diminish, a rule derived from principles might change in a way that makes it feasible again.

II. The Proviso of the Possible and the Limits of Adjudication
Constitutional law scholars have advanced various ideas on how to integrate the proviso of the possible into legal doctrine and its methods of review.Even though the proportionality test is the established method of fundamental rights review, it is contested whether this test is applicable to all types of rights.The case law compared above has shown that the courts, in practice, restrain from carrying out a comprehensive proportionality test.Instead, they primarily test whether the state has taken steps to fulfill the right, used its resources efficiently, and acted in a nondiscriminatory manner.These observations make it necessary to examine more closely why principles like "equality" and "efficiency" are more suitable for reviewing positive rights than the principle of "proportionality."Proportionality review is a two-stage test, starting with an analysis of the right's scope and an identification of an interference with that right at the first stage, followed by a judicial review of the interference at the second stage, which consists of four sub-stages: (a) legitimate aim, (b) suitability and necessity and (c) proportionality stricto sensu.111This last stage is the "heart" of proportionality review.The colliding principles are weighed against each other in a dogmatic procedure, better known as balancing.According to the understanding of rights as optimization requirements, almost any inaction by the state qualifies as an interference with that right.For example, a right to education might grant a claim to certain educational services, and if the state does not provide the services, the right is not fulfilled.For that reason, most cases will enter the second review stage.

a. The Legitimate Aim of State Inaction
Proportionality demands that the state pursues a legitimate aim when interfering with rights.This condition cannot easily be applied to positive rights as it is doubtful whether the state pursues any aim when doing nothing.Ingrid Leijten correctly emphasized that "when government inaction is concerned, 'not taking a measure' is not really directed at any aim at all."112 Public authorities, while not weighing every possible option to act, at least consider selected options and prioritize 109 Alexy, supra note 36 at 48.   110   Id. at 57. some over others.The prioritized options often form a complex bundle of heterogeneous principles.One specific state inaction is almost never precisely attributable to another specific action that has been performed instead.Statements like "the money spent for the military would have been better spent on schools" ignore the complexity of distributive decisions as there are usually not just two but multiple options as to how public funds can be spent.This makes it hard to identify the legitimate aim of state inaction for the purpose of proportionality review.The mere "lack of resources" alone cannot "justify non-compliance" with fundamental rights. 113It has been suggested that an unfulfilled positive right could be weighed against a "principle of financial capacity," 114 a "principle [ : : : ] of the sparing use of public resources," 115 the "financial resources available to the state," 116 simply the "rights of others," 117 as well as formal principles like the "principles of the separation of powers and democracy." 118Looking back at the case law examined in Chapter B, one also finds broad, abstract catch-all aims that are supposed to be balanced by the legislator.The ECtHR calls for striking a "fair balance" between the positive obligations and the "demands of the general interest of the community." 119The constitutional courts expect the legislator to balance the fundamental rights to state benefits against "other welfare concerns as well as the demands of overall economic balance" (Germany) and "other constitutionally protected interests" (Italy). 120These principles provide only abstract reasons that might justify the limitation of state benefits in general.They share the common public interest to save resources and spend them on purposes other than the claimant's right. 121

b. Suitability and Necessity -The Pareto Test
The intermediary stages of suitability and necessity tend to be underestimated, though they could play a significant role in the judicial review of positive rights.Reviewing these principles is less challenging than the final balancing (c) since it does not require carrying out an interpersonal utility comparison. 122Suitability presupposes that the action or inaction interfering with the right identified at the first stage of the proportionality test promotes the achievement of the legitimate aim.The necessity test then checks whether alternative options for achieving the aim are equally suitable but less restrictive.However, the state is not obliged to choose a less effective means.Both principles are expressions of the general principle of Pareto efficiency. 123In accordance with this principle, it is objectively unjust (Pareto inferior) to deny a distribution of goods to one person that could be made without anyone else being worse off. 124In the allocation cases investigated here, the state cannot refuse to fulfill a fundamental right if the omission results in even higher costs or if money has already been spent and using the available resources is not causing additional costs.
First, state inaction is not suitable for saving resources if, in a particular situation, investing public funds would save even more resources.In some evident cases, courts ruled that inaction was not suitable to save money because the funds saved by doing nothing were lower than the costs due to the omission.In Plyler v. Doe, the U.S. Supreme Court recognized the "significant social costs" caused by the denial of public education to children of illegal migrants and concluded "that whatever savings might be achieved by denying these children an education, they are wholly insubstantial in light of the costs involved to these children, the State, and the Nation." 125econd, state inaction is not necessary to save costs if the resources already invested are inefficiently distributed.For example, if a state bought a certain amount of vaccine doses but failed to distribute these doses in a timely manner, with the result that fewer people get vaccinated than would have been possible, the right to health is infringed.However, no court will adjudicate a substantive claim to a vaccine dose under these circumstances, but it may enforce a claim to an efficient procedure that might increase the chance to participate earlier in the existing capacities.
The case law presented in Chapter B has demonstrated how courts can review positive rights under the Pareto efficiency criterion.The German FCC checked whether the capacities of higher education at universities were efficiently calculated and exhausted, while the ECtHR assumed a violation of the right to the protection of life, either because police authorities had carried out investigations inefficiently or because public health care systems were badly organized.The proviso of the possible is inadmissible in these types of cases as non-performance of the right is not due to resource constraints but due to the inefficiency of public authorities.To achieve Pareto-optimality, the authorities must distribute the already allocated resources more efficiently.The reallocation of the overall budget is not necessary.For that reason, a judgment obliging a state to achieve a Paretoefficient distribution of benefits will not incur opportunity costs.Consequently, the Pareto efficiency test will never result in a substantive state obligation to spend more resources to promote a fundamental right.In this way, the right to a Pareto-efficient distribution is only of a procedural nature, like the participatory right to state benefits grounded in the principle of equality.

c. Balancing on a Spider Web
When leaving "Pareto-land," 126 an interpersonal utility comparison becomes inevitable.At this review point, "a fair balance between the competing interests of the applicants and the community as a whole" must be struck. 127This is the starting point for the final part of proportionality review, the test of proportionality stricto sensu.Proportionality is supposed to be examined through the balancing of the right under review with competing principles.Balancing is the established standard method of legal reasoning in fundamental rights law because its application ensures that the stakes of all concerned stakeholders are properly disclosed and compared. 128Its transparent structure makes this method unsuitable to "hide judicial activism" and "political intentions." 129he translation of the legal operation of balancing into an arithmetic formula ("Weight formula" 130 ) is supposed to be proof of its comprehensive rationality.In this way, the rules of an open legal discourse are combined with the economic theory of rational choice.The result of balancing is the establishment of a "conditional" preference relation between the competing principles. 131This preference relation expresses which right must be prioritized in a certain situation.At first glance, this methodological approach appears to be suitable for the review of  distributive conflicts.If this were the case, the proviso of the possible would "simply express the need for the right to be balanced." 132Why have courts not assessed with strict scrutiny whether the "fair balance" between the competing needs of the rightsholder and the community has been struck?From the comparative study in Chapter B, it appears that the proviso of the possible expresses the failure of balancing and, thereby, the limits of adjudicating distributive conflicts through balancing.The reason for that could lie in the "polycentric" structure of such conflicts and the lack of a "common metric" 133 as a prerequisite for rational balancing.
Allocative conflicts differ decisively from classical fundamental rights conflicts, such as the conflict between the mother's right to abortion and the life of the unborn child or the smoker's right to smoke and the right to health of people exposed to the smoke.In the latter cases, the conflict arises from the natural incompatibility of the rights.The proviso of the possible applies in allocative conflicts when rights must be limited only due to their costs and the necessary prioritization of needs.Fundamental rights to certain benefits and the public interest in using the resources for other purposes would not compete if the community's resources covered the costs of all individual and collective needs. 134Conflictual relations between those positive needs only occur when and in so far as it is not possible to fulfill them altogether due to a limitation of the factual possibilities.When allocative conflicts occur, they are not restricted to a limited number of rights and policies as in the classical binary conflict situation.Instead, all legitimate needs, which could be satisfied by accessing the relevant funds, get involved.At this point, transparent balancing requires that all individual and collective needs hidden behind catch-all-aims, such as the "rights of others" and the "competing substantive principles," be revealed. 135Introducing all these principles and the corresponding needs into the balance means introducing virtually everyone's interest. 136While someone would like to pay less tax, someone else might want to be prioritized in the allocation over the claimant, and a third party could want the state to invest more in a space program or in public theatres.
A simple example can demonstrate the structure of such allocative conflicts.For that purpose, we assume that there are ten legitimate needs.The needs are based on different fundamental rights and legitimate public policies.The fulfillment of each of the needs would cost €1.At that specific point in time, the responsible state disposes of a budget of €10 covering all needs.In this situation, there is no conflict between rights and policies.All rights and policies can be (optimally) fulfilled.Later, the budget decreases to €9.Now, the state has to prioritize among the needs and refuse the fulfillment of one of the needs.Balancing would require comparing and weighing all of the needs against each other, resulting in a number of preference relations of 45(!).Considering that the number of needs can be much higher, this example only gives an impression of the complexity of distributive conflicts.If one tries to visualize the conflictual structure by linking the needs as dots on a map, the result will resemble the structure of a polycentric "spider web."Lon Fuller described the complications that occur in any attempt to solve polycentric conflicts: "A pull on one strand will distribute tensions after a complicated pattern throughout the web as a whole." 137Polycentric conflicts may not be "unsuitable for adjudication." 138Nevertheless, it is challenging to consider all the "interests of non-represented persons" when adjudicating such conflicts.139132 Id. at 346 (in this translation by Julian Rivers: "reservation of the realizable").The establishment of preference relations in this conflictual setting would require a constitutional ranking of all competing principles. 140This ranking could only be established if the values of the principles could be measured on a ratio scale. 141However, no "common metric" exists for fundamental rights and other constitutional principles.In contrast to the economic theory of rational choice, constitutional theory cannot resort to a neutral currency, such as the market price of goods, to assess the rationality of a distributive decision. 142No constitution or charter of rights provides guidance for allocating the "marginal dollar" or euro that "may be more wisely spent on reducing pollution or strengthening the military or improving the quality of the roads." 143he conflict in question should not reach a level of complexity that exceeds the "connective capacity" of the legal system so that it "is no longer possible to relate every element to every other one." 144If multiple rights and other legitimate needs compete for the state's limited resources, the connective capacity of the balancing method as a means for legal decision-making gets exhausted. 145

Do Equality Rights have Costs, too?
While the proportionality test and balancing fail to establish a value-based ranking of multiple competing needs, equality rights might at least guarantee everyone non-discriminatory participation in state benefits.Equality rights demand that public resources allocated by the budgetary legislator at the macro level be distributed to individual beneficiaries at the micro level free from discrimination.The principles of equality and non-discrimination result in a derivative right to participate in existing capacities.This right also protects receivers of state benefits from being unequally treated through reductions of their benefits.The burdens of retrogressive measures must be shared equally.Deviations from the principle of equality require justification.The recognition and enforcement of the principle of equality and non-discrimination in allocative conflicts has been observed in all the jurisdictions, compared in Chapter B. The German FCC has subjected a right to educational services to the proviso of the possible but enforces a right to equal participation in the existing capacities of educational facilities, while the ECtHR, on several occasions, reviewed whether the access to existing state benefits schemes was discriminatory.In Italy, the Corte Costituzionale reviewed austerity measures against the principle of equality, checking whether different groups were treated unequally by the retrogressive legislation without reasonable cause.
Why is the principle of equality more suitable to review allocative conflicts from a fundamental rights perspective?The reason is the scope of non-discrimination review remains focused on an appropriate comparator group, meaning that a court will only test whether, for instance, students applying for the same study programme or patients suffering from a similar illness and in need of a similar treatment get an equal share of the state benefits allocated for their specific needs.Therefore, a student applying for university can claim to be treated equally with other applicants.However, if his application has been rejected in a non-discriminating procedure, he may not claim that the state creates additional capacities at the expense of other legitimate needs. 146ue to resource constraints, there is no reason to restrict this right to participate in existing capacities in a non-discriminating procedure because the legislator is not obliged to reallocate the budget.In many cases, the discrimination can even be remedied in a cost-neutral way: in order to treat everyone equally without causing higher costs, the legislator may either lower the quality of the services or discontinue the services altogether. 147Some authors have criticized this option of "levelling down," arguing that equality understood in this way would leave everyone worse off. 148his perspective ignores the inevitable incurrence of the opportunity costs of "levelling up."If the legislator were sanctioned to "level up" the capacities at stake to achieve the desired equality, the additional costs would make the reduction or omission of other state services necessary."Levelling up" a state benefit in favor of one applicant always requires "levelling down" other benefits.Evaluating such trade-offs would require the court to carry out its own balancing and substitute its own assessment for the legislator's.However, for the reasons outlined above, judicial balancing fails in allocative conflicts.For that reason, "levelling down" is acknowledged by the judiciary as a legitimate option to comply with the principle of equality. 149Otherwise, the enforcement of equality rights would not be cost-neutral.Even though the principle of non-retrogression has often been propagated, it has never been recognized by constitutional courts as a legal principle. 150he right to equal participation in state benefits is a mere procedural and derivative right that exists only as long as the state voluntarily provides a benefit.However, it cannot be assumed that such rights can always be fulfilled free of charge.Procedural rights incur procedural costs because administrating the distribution of goods occupies technical resources and administrative staff. 151I.The Quest for Legitimacy: Who decides about the Possible?
If legal balancing does not reveal whether a positive right is preferred over other competing needs, a court has options: it can prioritize the right regardless of the outcome of balancing and place a duty on the state to give its reasons.It would then be up to the authorities to justify the nonfulfillment of the right.If their reasoning is not persuasive, the right will still trump the will of the majority.This is what legal theorists call the "priority-to-rights-principle." 152While this approach must be applied when the state actively interferes with personal freedoms, it is unsuited for resolving allocative conflicts. 153Another option would be to shift the burden of justification by granting a wide margin of discretion to the public authorities while not placing a high burden of justification on them. 154As demonstrated above, constitutional courts usually do this in conflicts over scarce resources.Courts acknowledge both the "epistemic discretion" in assessing the factual possibilities as well as the "structural discretion" in prioritizing politically preferred options over others. 155 limits of adjudication in complex polycentric conflicts.Beyond this, granting discretion means assigning decision-making powers and prerogatives to other branches.By refraining from taking the final decision constitutional courts define their role and function within a particular institutional framework, and draw a line between law and politics.The compared case law has shown that all courts share the general assumption that "it is first of all up to the legislatures to decide how to allocate the financial resources of a state, thereby considering all the needs of society, and deciding upon priorities." 156The courts only intervene in exceptional cases if the distribution of scarce goods is evidently imbalanced.In this respect, the application of the proviso of the possible and the margin of discretion linked to it amounts to an "inversal" of the principle of proportionality. 157Consequently, the burden of justification shifts.Accordingly, the state does not carry the primary burden to prove the reasonableness of its inaction.Instead, it is up to the applicant to justify why the alleged entitlement to state benefits should be "so important from the perspective of constitutional law that decisions about them cannot be left to a parliamentary majority." 158Applying the proviso of the possible thus means acknowledging the principle that distributive decisions can and should be left to a parliamentary majority.This principle prioritizes political autonomy over the autonomy of individual rightsholders in allocative conflicts, thereby presupposing a certain model of the separation of powers (1).As a principle, it is not absolute, meaning that it does not preclude the judiciary from reviewing minimum rights to safeguard individual autonomy in exceptional cases (2).

The Proviso of Also Being Possible Otherwise
The constitutional concept of the separation of powers is grounded in the tension between individual and collective self-determination. 159It has been demonstrated through this investigation that individual and collective needs compete when scarce resources are at stake.The separation of powers is supposed to guarantee that both the individual and public interests are sufficiently represented in public decisions.A simple but instructive model of the separation of powers assigns decisions to the state powers depending on the mode of self-determination they represent. 160The political branches, comprising parliament as a legislator and the government as head of the executive branch, are elected by a democratic majority.These branches primarily represent the collective self-determination of society, and their decisions are acknowledged as binding due to their democratic legitimacy.Constitutional courts, on the other hand, have a "counter-majoritarian" function when adjudicating rights.Court rulings on constitutional rights complaints represent individual self-determination.Based on individual legitimacy, a constitutional court can enforce rights and overrule democratically legitimated majority decisions that have unduly marginalized individual autonomy.This model is abstract enough to apply to both the national constellation and international regimes, such as the ECHR and the institutional relationship between the ECtHR and national authorities.
Which branch should decide about the allocation of public resources in accordance with this model of the separation of powers?Answering this question requires reconsidering the particularities of allocative conflicts.costly rights can only be fulfilled at the expense of other rights and public needs.Cost-effective rights always incur opportunity costs.These opportunity costs need to be borne by the community.To fulfill a positive right, taxpayers must raise the necessary funds, other citizens who desire state benefits must renounce their needs, and the democratic majority must adjust its distributive policy accordingly.Due to the inherent tension between individual and collective needs, the decision-making procedure must enable the participation of all stakeholders. 161olitical elections and parliamentary debates, in contrast to court procedures, guarantee that multiple interests can be considered and integrated into the decision-making process.Everyone who desires additional state action can make use of their political rights.The budgetary debate offers members of parliament, as representatives of the entire electorate, the opportunity to deliberate over plural views and interests.In this way, every individual citizen is simultaneously the co-author and addressee of the budgetary laws governing the spending of public resources. 162owever, this integrative capacity of political procedures is only one reason for primarily assigning allocative decisions to the political branches and not the constitutional courts.
Another reason lies in the higher flexibility and revisability of democratic decisions.The different sources of legitimacy correspond with different modes of decision-making and justification.In contrast to the legislator and the government, constitutional courts are supposed to remain independent and isolated from politics to safeguard individual self-determination effectively.For that reason, a constitutional court cannot ground its decisions on the outcome of majority voting alone.Instead, a court "labors under an obligation to persuade,"163 meaning it must provide comprehensive reasoning with its "claim to correctness."164By contrast, lawmakers are more flexible.As democratic majorities are subject to change, political decisions are contingent and revisable after later elections.Contingency means that things "could always be otherwise." 165ontingent decisions made by political bodies are not necessarily a matter of right or wrong; they only express the preferences of a democratic majority at a certain point in time.At a later point in time, these preferences or their underlying circumstances might change.This is important in the context of distributive decisions.The relevant allocative decisions are revisable if the legislator or the government misjudged the factual possibilities or the majority changed its preferences.In such a situation, the proviso of the possible takes on the meaning of a "proviso of being possible otherwise."166From the perspective of the democratic legislator, the polycentricity of allocative conflicts is challenging but does not hinder the decision-making process.Due to the contingency of budgetary decisions, preferences can be adapted to shifting democratic majorities without necessarily striking a constitutionally correct balance between all needs.

A Limit to the Limitation: The Proviso of the Possible and Minimum Rights
All courts that have been subject to comparison in Chapter B recognize that a right must not be deprived "of its substance" 167 even if it incurs costs and resources are limited.This coincides with the understanding of core obligations pursuant to the International Covenant on Economic, Social and Cultural Rights (CESCR).According to the General Comments and the Maastricht Guidelines, the core obligations are "non-derogable" and must be fulfilled "irrespective of the availability of resources." 168Consequently, the proviso of the possible does not apply where the "minimum core" of a fundamental right is concerned.The limitation set by the proviso of the possible cannot be limitless.The model of legitimacy explained above shows that the tension between individual and collective needs cannot be unilaterally dissolved in favor of the majority and its collective will.In some situations, the individual would lack essential preconditions of an autonomous life if the state did not provide basic core services and benefits.Courts might not be capable of legitimately striking the judicially correct balance between individual and collective needs; however, they are responsible for the prevention of evidently imbalanced allocative decisions by enforcing minimum rights in favor of individual self-determination.Accordingly, the proviso of the possible as a limitation to rights and minimum rights as limits to this limitation are complementary counterparts.The realm of the proviso of the possible ends where the minimum core of a right begins. 169Nevertheless, before considering a violation of the minimum core of a right, courts should test whether the state has complied with equality rights and the criteria of Pareto efficiency to avoid costs.Only if these tests do not provide effective legal protection is the enforcement of a minimum right considered.The definition of a minimum right remains challenging; it exceeds the scope of this inquiry into the proviso of the possible to develop a comprehensive doctrine of minimum rights. 170The approaches to minimum rights outlined below intend to demonstrate the complementary relationship between the proviso of the possible and minimum rights.
Minimum rights should not be understood as clearly defined entitlements.Since the availability of resources and social circumstances change over time, a static model of minimum rights would not provide effective safeguards against actual threats to autonomy.Minimum core doctrines may also vary between jurisdictions and depend on the primary decisions of a particular constitution.A universal formula for the definition of minimum rights does not exist.Corresponding to the flexible "width" of the margin of discretion, minimum rights differ in their "hardness."Courts apply stricter scrutiny to the minimum core if the state has monopolized the means of protection (for example, the police or the judiciary), if an individual is already subject to active state interference with his fundamental rights (for example, a prisoner demanding medical care or legal advice), and if high-ranking legal values such as human dignity are concerned.Under these specific circumstances, the individual is particularly dependent on state aid and cannot be expected to help himself.Courts can also approach the minimum core by adjusting the margin of discretion.There is a "flexible scale and correspondingly many ways in which the burden of proof can shift" either to the state or the individual claimant. 171As explained above, the margin of discretion that courts apply when fundamental rights incur costs is wide from the outset.By narrowing the margin of discretion again, courts incrementally narrow down the core content of a right.To calibrate the burden of justification, courts can, as a first step, examine whether the state remains completely inactive or provides at least some basic benefits.The calibration process can result in a shift in the burden of justification.The German FCC applies such a procedural approach to selected fundamental rights.In its judgments on the right to a dignified subsistence level, the FCC does not define the exact amount of social assistance the state is obliged to provide.Instead, the court reviews whether the amount set by the legislator is based on a consistent calculation considering all relevant needs and socioeconomic metrics.The approach cannot be generalized and transferred to all fundamental rights.It appears to be particularly suitable for reviewing fundamental rights to certain cash benefits linked to clearly defined purposes or needs.
Although the minimum right is not subject to the proviso of the possible, the cost impact of each minimum right should not be disregarded.In particular, courts should consider whether the adjudication of a minimum right constitutes a precedence that can be generalized and applied to other cases, resulting in additional costs.They should, therefore, stay focused on the case and define only narrow minimum standards with respect to the individual needs of the applicant.For instance, the FCC stated in Bundesnotbremse II that the state was obliged to compensate for the school lockdowns by providing remote teaching online during the pandemic. 172The court avoided making further statements on the minimum core of the right to education because they were not relevant to the ruling.By only adjudicating minimum core rights in exceptional cases and under certain conditions and circumstances, courts can minimize the cost impact of their rulings.

D. Conclusion
Considering the findings of the comparative study (B) and the theoretical investigation of the proviso of the possible (C), the following conclusions can be drawn.All courts need to recognize resource constraints as limitations to costly rights.Several constitutional courts in Europe apply the proviso of the possible as part of their settled case law.The proviso of the possible is a concept of fundamental rights doctrine to deal with conflicts over scarce resources.It addresses the methodical as well as the legitimation challenges posed by these conflicts.The ECtHR has not yet taken up the concept itself but accepted its application while using its established doctrinal concepts, such as the Osman test or the "even wider" margin of appreciation.It is common to the jurisprudence of all courts compared herein that they restrain from substituting the legislator's assessment of budgetary choices.The courts do not carry out a comprehensive proportionality test.Instead, they primarily review whether the state has complied with the principle of Pareto efficiency and the principle of equality.The enforcement of both principles does not fundamentally interfere with the budgetary discretion of the legislator.In specific cases, courts have defined minimum rights that are not subject to the proviso of the possible.Thus, the investigation has revealed the limits of adjudication in allocative conflicts and demonstrated the extent to which courts can review cost-effective rights.The proviso of the possible not only results in a limitation of fundamental rights to what is factually feasible, but its application also means granting a wide margin of discretion to political branches.Due to the proviso of the possible, it is up to them to make contingent decisions on how to allocate public resources.Consequently, allocations subject to the proviso of the possible are "also possible otherwise."Only minimum rights are not subject to the proviso of the possible.While minimum rights guarantee the effective judicial protection of individual self-determination, the proviso of the possible marks the wide realm of democratic self-determination over the allocation of public resources.European societies facing a horizon of limited possibilities must establish political majorities that make the necessary distributive decisions, which, by their very nature, will always result in wins and losses.Democratic legitimacy is essential to generate acceptance for these decisions.Fundamental rights can only be a "fallback" position, not a starting point for solving distributive conflicts in a constitutional democracy.Lino Munaretto 18
Distributive decisions concern multiple stakeholders because 156 E. W. Vierdag, The Legal Nature of the Rights Granted by the International Covenant on Economic, Social and Cultural Rights, 9 NETHERLANDS YEARBOOK OF INTERNATIONAL LAW 69, 91 (1978); similar: Aryeh Neier, Social and Economic Rights: A Critique, 13 HUMAN RIGHTS BRIEF 1, 2 (2006); Beijer, supra note 3 at 81.THE THREE BRANCHES: A COMPARATIVE MODEL OF SEPARATION OF POWERS 4 (2013); see also: Bruce Ackerman, The New Separation of Powers, 113 HARVARD LAW REVIEW 633 (2000); EOIN CAROLAN, THE NEW SEPARATION OF POWERS: A THEORY FOR THE MODERN STATE 263 (2009).