This paper surveys the literature on group selection. I describe the early contributions and the group selection controversy. I also describe the main approaches to group selection in the recent literature; fixation, assortative group formation, and reproductive externalities. -- Altruism ; spite...

Family businesses make up forty percent of the Fortune 500 companies in the US, generate about two-thirds of the German GDP, employ about one-half of the labor force in Britain, and account for the majority of the private economies in developing countries. This paper develops a theory of family...

Previous work on the effects of private income transfers has been confined to intra-family interactions. One implication of this work is that such transfers benefit recipients by insuring against labor market risks. Allowing for equilibrium labor market responses, however, one would expect the...

Previous work on the effects of private income transfers has been confined to intra-family interactions. One implication of this work is that such transfers benefit recipients by insuring against labor market risks. Allowing for equilibrium labor market responses, however, one would expect the...

We conduct field experiments in a large real-world social network to examine why decision-makers treat their friends more generously than strangers. Subjects are asked to divide a surplus between themselves and named partners at varying social distances, but only one of these decisions is...

We examine how economic incentives affect pro-social behavior through the analysis of a unique dataset with information on more than 14,000 American Red Cross blood drives. Our findings are consistent with blood donors responding to incentives in a "standard" way; offering donors economic...

A substantial body of research suggests that economists are less generous than other professionals and that economics students are less generous than other students. We address this question using administrative data on donations to social programs by students at the University of Washington....

From 1917 to 2012, donations by high-income households in the USA have moved inversely with income inequality. This association contradicts historical narratives and prevailing theory, both of which that imply that high-income households donate rising income shares when inequality increases. The...

We study a credence goods problem - that is, a moral hazard problem with non-contractible outcome - where altruistic experts (the agents) care both about their income and the utility of consumers (the principals). Experts' preferences over income and their consumers' utility are convex, such...