cooperation in the presence of "multi-directedness," whereby people's preferences depend on their psychological motives. People …

We use skin conductance responses and self-reports of hedonic valence to study the emotional basis of cooperation and …. The application of sanctions activates a "virtuous emotional circle" that accompanies cooperation. Emotionally aroused … punished, and increase their subsequent level of cooperation. The outcome is an increased level of contribution that becomes …

Vaccination represents a canonical example of externalities in economics, yet there are few estimates of their …

This paper provides evidence for informational spillovers within urban slums in Chandigarh, India. I identify three … children. Spillovers to neighboring (untreated) mothers can be through social learning or imitation. Results from a difference … control group. Neighboring mothers exhibit learning spillovers, changes in dietary behavior and a reduction in food …

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 …