norms. In recent years, there has been substantial progress, however, on how cooperation norms are enforced. Here we review … insights into the proximate and ultimate forces behind human cooperation. …

Evolutionary theory reveals that punishment is effective in promoting cooperation and maintaining social norms …

cooperative strategies to invade populations of stable defecting strategies. We adapt this idea of population clustering to a two … clustering to bargaining environments sustains cooperative play analogous to the situation in finitely repeated PD games. …

organized before some of the games was used as an additional control. Our results show that the degree of cooperation is rather …

TO THE ECONOMIC ACTION AND FOR COOPERATION. …

People can become less cooperative when threatened with sanctions, and researchers have pointed to both 'intentions … the relative importance of intentions and incentives in producing non-cooperative behavior in a personal exchange …

behavior. We propose that religious rituals promote in-group trust and cooperation that help to overcome collective …-action problems. We test this hypothesis on communal societies for whom mutual cooperation is a matter of survival. We design field … experiments to measure the in-group cooperative behavior of members of religious and secular Israeli kibbutzim. Our results show …