We investigate how group boundaries, and the economic environment surrounding groups, affect altruistic cooperation and … harm those who defect, encouraging a norm of cooperation towards the group. Adding competition between groups causes even … stronger in-group cooperation, but also a qualitative change in punishment: punishment becomes antisocial, harming cooperative …

This paper experimentally examines how religious festivals and the degree of religiosity affect cooperation and … religious festivals other than the normal daily prayers. The overall results show no differences in cooperation or altruistic … differences in beliefs about others contributions. By and large, this indicates the importance of conditional cooperation …

There is continuing debate about what explains cooperation and self-sacrifice in nature and in particular in humans …

Efficiency under contractual incompleteness often requires voluntary cooperation in situations where self … gift-exchange game of how explicit and implicit incentives affect cooperation. We first show that there is substantial … cooperation under non-incentive compatible contracts. Incentive-compatible contracts induce best-reply effort and crowd out any …

cooperative task. The data show that clerical workers differ from college students in overall cooperation rates, strategy adoption … and use of punishment opportunities. Students cooperate more than workers. Cooperation increases in both subject pools … defection, and more likely to select strategies of conditional cooperation. Finally, students are more likely than workers to …

stage, determines the optimum level of the transfer within a relationship of one-sided altruism. In the second stage, the … compensatory way in an altruism model …