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 study whether group identity mitigates inefficiencies associated with appropriable quasi-rents, which are often created by relationship-specific investments in bilateral trade relationships. We conjecture that group identity strengthens the effect of an agent's generous action in increasing...

We experimentally study the relationship between other-regarding preferences, group identity and political participation. In doing so, we propose a novel group identity induction procedure that succeeds in creating environments where in-group bias is either high or low. At the individual level,...