We develop a model in which states may choose to form coalitions to capture efficiency gains from policy coordination. Joining a coalition entails setting the policy variable to maximize the coalitions' aggregate payoff at a Nash equilibrium against nonmembers, and to commit to a transfer scheme...

This paper models the coalition formation process among primates as a sequential game. The population consists of primates having distinct social ranks. The rank of each individual is determined by his resource holding potential. Each member of the population is interested in gaining access to a...