This manuscript examines how growing up with a sibling relates to prosociality and how knowledge of a partner’s sibling background may serve as a behavioral cue. In a series of experimental games, we found that individuals with siblings were significantly more likely to cooperate in stag hunt and contribute more in public goods and dictator games than only children (OC) on average. In two treatments where a sibling status cue is exogenously revealed, only-child pairs exhibited reduced prosociality. OC exhibit different empirical expectations of behavior compared to those with siblings, while generally sharing the same normative beliefs. Language AI analysis of subjects’ written perspectives on the games corroborates these patterns. We conclude that OC exhibit more context-dependent prosociality, with behavior more closely aligned with empirical expectations than normative beliefs, a pattern not observed in those with siblings.

As large language model (LLM)-based agents increasingly engage with human society, how well do we understand their prosocial behaviors? We (1) investigate how LLM agents’ prosocial behaviors can be induced by different personas and benchmarked against human behaviors and (2) introduce a social science approach to evaluate LLM agents’ decision-making. We explored how different personas and experimental framings affect these AI agents’ altruistic behavior in dictator games and compared their behaviors within the same LLM family, across various families, and with human behaviors. The findings reveal that merely assigning a human-like identity to LLMs does not produce human-like behaviors. They suggest that LLM agents’ reasoning does not consistently exhibit textual markers of human decision-making in dictator games and that their alignment with human behavior varies substantially across model architectures and prompt formulations; even worse, such dependence does not follow a clear pattern. As society increasingly integrates machine intelligence, “prosocial AI” emerges as a promising and urgent research direction in philanthropic studies.

We develop and validate a survey instrument to elicit six key economic preferences in children: undefined time preferences, risk preferences, altruism, positive reciprocity, negative reciprocity, and trust. The survey was administered to a sample of 339 nine-year-old children, for whom we also collected behavioral data through incentivized choice experiments targeting the same preferences. Our econometric analysis allows us to identify a set of 14 survey items that best predict children’s experimental behavior. For each preference, we also compare the predictive power of this 14-item validated survey to a shorter 9-item self-evaluation version. Our results demonstrate that these surveys provide a simple and reliable tool for measuring individual preferences in children – enabling researchers to account for heterogeneity when designing and evaluating policies targeting younger populations.

This article examines the link between personality traits, political attitudes and the propensity to vote in elections, using an Internet panel survey conducted in two Canadian provinces at the time of the 2008 federal election and the subsequent provincial elections. It first establishes that the two most proximate attitudes that shape one's propensity to vote are political interest and sense of civic duty. The article then look at specific personality traits (altruism, shyness, efficacy and conflict avoidance) that could affect level of political interest, civic duty and the propensity to vote in elections. In the last part of the analysis, a model is proposed and tested, according to which the impact of personality traits is indirect, being mediated by interest and duty. The article shows that the data are consistent with such an interpretation.

The present study aimed to explore underlying motivational factors of volunteerism at a special sporting event for persons with intellectual disabilities. The volunteer survey (n = 252) assessed sociodemographic characteristics, motives, satisfaction with life, psychological well-being, and affectivity of mainly intrinsically motivated volunteers versus traineeship attendees, doing a compulsory traineeship on occasion of the Innsbruck 2008 Winter Special Olympics. There was no significant variability in the motivation to volunteer scale (MVS) score between the groups. The inventory of approach and avoidance motivation (IAAM) data showed that primarily intrinsically motivated volunteers experienced higher self-gratification through their voluntary engagement. Regression analysis revealed that psychological well-being, satisfaction with life, and positive and negative affectivity was predicted by the IAAM and MVS. Individuals’ personal motives for volunteering appear to correlate with psychological well-being and affectivity and may influence prospective participation.

Most charity organizations depend on contributions from the general public, but little research is conducted on donor preferences. Do donors have geographical, recipient, or thematic preferences? We designed a conjoint analysis experiment in which people rated development aid projects by donating money in dictator games. We find that our sample show strong age, gender, regional, and thematic preferences. Furthermore, we find significant differences between segments. The differences in donations are consistent with differences in donors’ attitudes toward development aid and their beliefs about differences in poverty and vulnerability of the recipients. The method here used for development projects can easily be adapted to elicit preferences for other kinds of projects that rely on gifts from private donors.

While nonprofit organizations have traditionally been considered increasingly competing for resources, this paper mainly explores the potential mutual relationship between volunteering in sport and volunteering in culture. Drawing on 2014 data from the German Volunteer Survey, we estimated a bivariate probit model based on 27,293 observations. The findings suggested that sports and cultural volunteering were complementary activities. Thus, promoting volunteering in one of the domains positively affected volunteering in the alternative domain. Parental volunteering, religiosity, and education were primary drivers of both types of volunteering. However, differences in some determinants have also been found. For example, volunteering in culture was predominantly female, while male volunteers dominated sports.

Egoism is a pervasive trait in modern market societies that encourages people to focus upon their own self-interest above all else. Third-sector organizations, by contrast, are frequently termed “altruistic.” This essay elucidates the meaning of “altruism “ as it applies to these organizations. Moral altruism means direct concern for another’s well being—whoever that person might be. This study rejects psychological egoism as a meaningful psychological theory, and ethical egoism as a coherent moral position; it discusses empirical studies of altruism in rescuers of Jews in Nazi-occupied Europe as proof against the former form of egoism and Kant’s moral theory against the latter. The essay then argues that altruism is a form of public action in Hannah Arendt’s sense of this term. The essay concludes that third-sector organizations are altruistic insofar as they engage in public action, thereby, treating beneficiaries with respect for their individuality.

This study explores the role of framing, time pressure (TP), and gender in modulating altruism in preschoolers (4- and 5-year-olds, N = 115), using a Dictator Game (DG) paradigm. Besides confirming a strong tendency toward altruistic sharing in this age cohort, results allow us to investigate the psychological factors behind such a tendency. Initial resource allocation is manipulated by presenting both a Give and a Take condition to participants, which reveals the combined influence of status quo bias (more resources are shared in the Take condition than in the Give condition) and the endowment effect (fewer resources are shared in the Give condition than in the Take condition). Introducing TP results in greater sharing across both conditions, which confirms previous results and improves on them, allowing us to clarify that the intuitive heuristic activated by TP favors sharing specifically, rather than mere preservation of the status quo (otherwise we would observe increased sharing with TP only in the Take condition). Finally, a significant interaction between framing and gender is observed, with girls sharing more than boys in the Give condition and less than boys in the Take condition. This suggests that the traditional view of girls as being more generous than boys in DGs may be an experimental artifact of overreliance on Give-only paradigms, and it reveals instead that girls are more sensitive to fairness, whereas boys are more influenced by respect for the initial resource allocation. Overall, these findings provide valuable insight into the psychological determinants of altruism in early childhood, with important implications for adult studies as well.

In three between-subject experiments, involving a total of 3180 participants, the majority of respondents indicated that during a weather emergency they would continue to use high bandwidth functions after receiving a text message requesting only emergency use. Projected excess demand for bandwidth could bring down the cellular communication network in the affected area. Messages incorporating an appeal to altruism, the incentive of a reduced phone bill, and the disincentive of an imminent collapse of the network for 24 hours all had no effect on intentions to use high bandwidth functions. Younger respondents and male respondents were less compliant than older respondents and female respondents. Their responses imply that an increasing number of individuals view even a brief separation from their cell phone as an existential threat that overrides other concerns including empathy for people in life-threatening circumstances.

Culture consists of practices – behaviour patterns – shared by members of a group. Some attempts to demonstrate evolution of cultural practices in the laboratory have shown evolution of material products, such as paper aeroplanes. Some attempts have shown evolution of actual group behaviour. The present experiments demonstrated evolution of group coordination across generations in punishing defection in a public-goods game. Cost of punishing defection varied across replicates that consisted of series of groups (generations) of 10 undergraduates each. Each generation played the game anonymously for 10 rounds and could write messages to the other participants and punish defection every round. The effectiveness of punishment depended on the number of participants choosing to punish. In Experiment 1, cultural transmission from generation to generation consisted of written advice from one generation read aloud to the next generation. In Experiment 2, transmission from generation to generation consisted of having some participants return from the previous group. The cost of punishing varied across replicates: zero, one, two or five cents. In both experiments, the evolution of altruistic punishing was strongly dependent on the cost of punishing. The results add to plausibility of studying evolution of complex behaviour patterns like cooperation in the laboratory.

Since the early 1950s, national statisticians have regarded unpaid work as non-economic, excluding it from GDP. Feminist scholars argue this exclusion reflects a gender-biased view of progress that renders women’s non-market productivity invisible. As what gets measured drives policy priorities and resource allocation, breastfeeding highlights the need to account for women’s unpaid care work in economic statistics. This paper advances the Beyond GDP agenda by demonstrating how market-derived prices can improve the measurement and recognition of women’s lactation labour. We first trace the historical displacement of breastfeeding by commercial formula and identify key economic drivers. Next, we review critiques of GDP and debates over including non-market household services in the UN’s System of National Accounts. We then present novel estimates of breast milk’s economic value in selected countries. Our analysis shows that existing market prices can robustly proxy for breastfeeding work, correcting GDP’s gender bias and realigning policy priorities. Including human milk production in core economic indicators not only reflects its true contribution but also promotes women’s and children’s rights and supports sustainable development through comprehensive true-cost accounting.