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 …

prevent safe inferences about differences in social preferences. We present new evidence from a natural field experiment in …

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 …