In this study, we use an allocation game to study the effects of group identity and group size on in-group favouritism when the person's own payoff is not affected by her decision. We first show that in a triadic setting when the subjects are asked to allocate a fixed amount of resource between...

This paper shows how larger group size can enhance punishing behavior in social dilemmas and hence support higher levels of cooperation.We focus on describing conflict technology using Lanchester's equations and study the role of "collectivity" of punishment to support cooperation in large...