This paper discusses the relationship between justice and identity. While it is widely agreed that justice requires us to go beyond loyalty to our simplest identity – being just oneself – there is less common ground on how far we must go beyond self-centredness. How relevant are group identities to the requirements of justice, or must we transcend those too? The author draws attention to the trap of confinement to nationality and citizenship in determining the requirements of justice, particularly under the social-contract approach, and also to the danger of exclusive concentration on some other identity such as religion and race. He concludes that it is critically important to pay attention to every human being's multiple identities related to the different groups to which a person belongs; the priorities have to be chosen by reason, rather than any single identity being imposed on a person on grounds of some extrinsic precedence. Justice is closely linked with the pursuit of impartiality, but that pursuit has to be open rather than closed, resisting closure through nationality or ethnicity or any other allegedly all-conquering single identity. Christian List

This note provides an introduction to the accompanying article by Allan Gibbard that was originally written for the 1968–69 Harvard graduate seminar conducted by Kenneth Arrow, John Rawls and Amartya Sen.

This paper builds upon, but substantially revises, John Harsanyi's concept of ‘extended preferences’. An individual ‘history’ is a possible life that some person (a subject) might lead. Harsanyi supposes that a given spectator, formulating her ethical preferences, can rank histories by empathetic projection: putting herself ‘in the shoes’ of various subjects. Harsanyi then suggests that interpersonal comparisons be derived from the utility function representing spectators’ (supposedly common) ranking of history lotteries. Unfortunately, Harsanyi's proposal has various flaws, including some that have hitherto escaped scholarly attention. In particular, it ignores the limits of personal identity. If the subject has welfare-relevant attributes that the spectator cannot acquire without changing who she is, full empathetic identification of the latter with the former becomes impossible. This paper proposes instead to use sympathy as the attitude on a spectator's part that allows us to make sense of her extended preferences. Sympathy – an attitude of care and concern – is a psychological state quite different from empathy. We should also allow for hetereogeneity in spectators’ extended preferences. Interpersonal comparisons emerge from a plurality of sympathetic spectators, not (as per Harsanyi) from a common empathetic ranking.

Arrow’s impossibility result stems chiefly from a combination of two requirements: independence and fixity. Independence says that the social choice is independent of individual preferences involving unavailable alternatives. Fixity says that the social choice is fixed by a social preference relation that is independent of what is available. Arrow found that requiring, further, that this relation be transitive yields impossibility. Here it is shown that allowing intransitive social indifference still permits only a vastly unsatisfactory system, a liberum veto oligarchy. Arrow’s argument for independence, though, undermines any rationale for fixity.

Poverty indexes are essential for monitoring poverty, setting targets for poverty reduction, and tracking progress on these goals. This paper suggests that further justification is necessary for using the main poverty indexes in the literature in any of these ways. It does so by arguing that poverty should not decline with the mere addition of a rich person to a population and showing that the standard indexes do not satisfy this axiom. It, then, suggests a way of modifying these indexes to avoid this problem.

In criticizing communitarian views of justice, Amartya Sen argues that identity is not merely a matter of discovery but an object of reasoned choice subject to constraints. Distinguishing three notions of identity – self-perception, perceived identity and social affiliation – I claim that the relevant constraints implied by this argument are minimal. Some of Sen's arguments about perceived identity and social context do not establish any further constraints. Sen also argues that a model of multiculturalism and some forms of education can restrict, or fail to promote, reasoned and informed identity choice. This argument is better understood in the light of Sen's work on capability and justice, notably his concern with ways in which underdogs can adapt and his emphasis on public reasoning. It highlights limitations on information and opportunities for reasoning. I suggest that these lead to genuine constraints on (reasoned and informed) identity choice. The paper focuses on Sen's work, though its claims are also relevant to George Akerlof and Rachel Kranton's analysis of identity.

This paper develops a conceptual framework, which can accommodate a wide range of value judgements used in ethical evaluations of extended social states and which can be used to differentiate different categories of value judgements by referring to the type of information on which they may be based. The notions of consequentialism, non-consequentialism, exclusive focus on personal well-being, exclusive focus on utility, etc. are conceptualized in operational ways in the framework. The framework and the discussion of different types of ethical criteria that may be used in evaluating extended social states contribute to conceptual clarity about the ethical bases of public policies.

This paper presents Sen's theory of agency, focusing on the role of commitment in this theory as both problematic and potentially illuminating. His account of some commitments as goal-displacing gives rise to a dilemma given the standard philosophical theory of agency. Either commitment-motivated actions are externally motivated, in which case they are not expressions of agency, or such actions are internally motivated, in which case the commitment is not goal-displacing. I resolve this dilemma and accommodate his view of commitment as motivation by developing a broader descriptive theory of agency, which recognizes both agent goal-directed and goal-displacing commitments. I propose a type of goal-displacing commitment, which I call ‘tacit commitment’, that can be seen to fit between the horns. Tacit commitments regulate behaviour without being made conscious and explicit. This resolution suggests a means of bridging the normative/descriptive gap in social-scientific explanation.

We present a new class of models of players’ reasoning in non-cooperative games, inspired by David Lewis's account of common knowledge. We argue that the models in this class formalize common knowledge of rationality in a way that is distinctive, in virtue of modelling steps of reasoning; and attractive, in virtue of being able to represent coherently common knowledge of any consistent standard of individual decision-theoretic rationality. We contrast our approach with that of Robert Aumann (1987), arguing that the former avoids and diagnoses certain paradoxes to which the latter may give rise when extended in particular ways.

A capability approach prescribes paternalist government actions to the extent that it requires the promotion of specific functionings, instead of the corresponding capabilities. Capability theorists have argued that their theories do not have much of these paternalist implications, since promoting capabilities will be the rule, promoting functionings the exception. This paper critically surveys that claim. From a close investigation of Nussbaum's statements about these exceptions, it derives a framework of five categories of functionings promotion that are more or less unavoidable in a capability theory. It argues that some of these categories may have an expansionary dynamic; they may give rise to widespread functionings promotion, which would defeat the capabilitarian promise that paternalist interventions will be exceptions to the rule of a focus on capabilities. Finally, the paper discusses three further theoretical issues that will be decisive in holding this paternalist tendency in check: how high one sets threshold levels of capability protection, how lengthy one's list of basic capabilities is, and how one deals with individual responsibility for choices resulting in a loss of one's capabilities.

Human behaviour, like everything else, has causes. Most of the time, those causes can be described as reasons. Human beings perform actions because they have reasons for performing them. They are capable of surveying the options available and then selecting one based upon those reasons. But invariably occasions arise in which the reasons known to the agent fail to single out a determinate option. When reasons cannot determine the option to select on their own, the agent must resort to some form of non-reasoned decision-making (NRDM). This paper distinguishes four different forms of NRDM – picking, randomizing, deferring and judging. Each form may be appropriate under different circumstances. The paper concludes by laying out the theoretical assumptions upon which this account of NRDM rests.

In this paper we explore game-theoretic reasoning in dynamic games within the framework of belief revision theory. More precisely, we focus on the forward induction concept of ‘common strong belief in rationality’ (Battigalli and Siniscalchi (2002) and the backward induction concept of ‘common belief in future rationality’ (Baltag et al. 2009; Perea 2014). For both concepts we investigate whether the entire collection of selected belief revision policies for a player can be characterized by a unique plausibility ordering. We find that this is indeed possible for ‘common strong belief in rationality’, whereas this may be impossible in some games for ‘common belief in future rationality’.

A series of studies in experimental philosophy have revealed that people blame others for foreseen negative side effects but do not praise them for foreseen positive ones. In order to challenge this idea, also called the Knobe effect, we develop a laboratory experiment using monetary incentives. In a game-theoretic framework we formalize the two vignettes in a neutral way, which means that we abstain from the use of any specific language terms and can easily control and vary the economic parameters of the situation. We confirm the Knobe effect in one situation and present situations in which the effect vanishes or even reverses. Our results are in line with a theoretical approach where the assessment of intention is not based on the action itself but on the underlying motive – as modelled in Levine (1998).

Capability theorists have suggested different, sometimes incompatible, ways in which their approach takes account of the value of freedom, each of which implies a different kind of normative relation between functionings and capabilities. This paper examines three possible accounts of the normative relation between functionings and capabilities, and the implications of each of these accounts in terms of degrees of paternalism. The way in which capability theorists apparently oscillate between these different accounts is shown to rest on an apparent tension between anti-paternalism (which favours an emphasis on capabilities) and anti-fetishism (which favours an emphasis on functionings). The paper then advances a fourth account, which incorporates a concern with the content-independent or ‘non-specific’ value of freedom. Only the fourth account would remove all traces of paternalism from the capability approach. Whatever reasons advocates of the capability approach might have had for rejecting this fourth account, those reasons are not internal to the capability approach itself.

This article presents a community-based account of salience as an alternative and a complement to the ‘natural salience’ approach which is endorsed by almost all game theorists who use this concept. While in the naturalistic approach, salience is understood as an objective and natural property of some entities (events, strategies, outcomes), the community-based account claims that salience is a function of community membership. Building on David Lewis’s theory of common knowledge and on some of its recent refined accounts, I suggest that salience acts as a correlating device in a correlated equilibrium. What is constitutive of salience is common understanding, the fact that agents have common knowledge that they share the same modes of reasoning with respect to a well-identified set of events. I argue that the basis for common understanding is community membership. The relevance of this account stems from the fact that it answers the objection that salience is either unnecessary or unable to account for coordination between rational agents.

This paper examines a broad range of ethical perspectives and principles relevant to the analysis of issues raised by the science of climate change and explores their implications. A second and companion paper extends this analysis to the contribution of ethics, economics and politics in understanding policy towards climate change. These tasks must start with the science which tells us that this is a problem of risk management on an immense scale. Risks on this scale take us far outside the familiar policy questions and standard, largely marginal, techniques commonly used by economists; this is a subject that requires the full breadth and depth of what economics has to offer and a much more thoughtful view of ethics than economists usually bring to bear. Different philosophical approaches bring different perspectives on understanding and policy, yet they generally point to the case for strong action to manage climate change.

Both intertemporal and intratemporal equity are central to the examination of policy towards climate change. However, many discussions of intertemporal issues have been marred by serious analytical errors, particularly in applying standard approaches to discounting; the errors arise, in part, from paying insufficient attention to the magnitude of potential damages, and in part from overlooking problems with market information. Some of the philosophical concepts and principles of Paper 1 are applied to the analytics and ethics of pure-time discounting and infinite-horizon models, providing helpful insights into orderings of welfare streams and obligations towards future generations. Such principles give little support for the idea of discrimination by date of birth. Intratemporal issues are central to problematic and slow-moving international discussions and are the second focus of this paper. A way forward is to cast the policy issues and analyses in a way that keeps equity issues central and embeds them in the challenge of fostering the dynamic transition to the low-carbon economy in both developed and developing countries. This avoids the trap of seeing issues primarily in terms of burden-sharing and zero-sum games – that leads to inaction and the most inequitable outcome of all.