We investigate how group boundaries, and the economic environment surrounding groups, affect altruistic cooperation and punishment behavior. Our study uses experiments conducted with 525 officers in the Swiss Army, and exploits random assignment to platoons. We find that, without competition...

We investigate how group boundaries, and the economic environment surrounding groups, affect altruistic cooperation and punishment behavior. Our study uses experiments conducted with 525 officers in the Swiss Army, and exploits random assignment to platoons. We find that, without competition...

We investigate how group boundaries, and the economic environment surrounding groups, affect altruistic cooperation and punishment behavior. Our study uses experiments conducted with 525 officers in the Swiss Army, and exploits random assignment to platoons. We find that, without competition...

Firms are often organized into groups. Group membership has been shown empirically to have positive effects, in the form of increased pro-social behavior towards in-group members. This includes an enhanced willingness to engage in altruistic punishment of inefficient defection. Our paper...

Social science research has stressed the important role of religion in sustaining cooperation among non-kin. We contribute to this literature with a large-scale empirical study documenting the relationship between religion and cooperation. We analyze newly available, experimentally validated,...