lifting) matter less when individuals are more patient and altruistic, or exhibit less negative reciprocity. To account for …

reciprocity, altruism, and trust from 80,000 individuals in 76 countries. The data reveal substantial heterogeneity in preferences …

To understand the "pure" incentives of altruism, economic laboratory research on humans almost always forbids … communication between subjects. In reality, however, altruism usually requires interaction between givers and receivers, which … altruism are built on human sociality. We experimentally examine communication in which one subject allocates $10 between …

experiment during the Salvation Army's annual campaign. The familiar bell-ringers were placed at one or both of two main … awareness of the empathy-altruism link, rather than pernicious social costs of fundraising …

We present evidence from a natural field experiment involving nearly 100,000 individuals on the effects of offering …

. This study overlays randomization on a naturally-occurring environment in a series of temporally-linked field experiments …. Second, we can reject the pure altruism model of giving. Third, we find that public good provision is maximized in both the …

consumption and donations among individuals. We also conduct an original experiment that enables nonparametric tests of many … donations yield greater explanatory power than the standard model of impure altruism …

Theories abound for why individuals give to charity. We conduct a field experiment with donors to a Yale University … theories, we conduct a laboratory experiment with undergraduates, and find no evidence to support the alternative, altruistic …

We present a dictator game experiment where the recipients are local charities that serve the poor. Donors consist of … respondents an audiovisual presentation about the recipients. The experiment yields three main findings. First, we find …