We show how norms can solve the distributional conflict inside a group in an anarchic environment and yield efficient coordination of collective action in a conflict with an external competitor. The equilibrium of the fully non-cooperative game with finite horizon has two interesting features....

The effects of stake size on cooperation and punishment are investigated using a public goods experiment. We find that an increase in stake size does neither significantly affect cooperation nor the level of punishment.

We show in a public goods experiment on three continents that conditional cooperation is a universal behavioral regularity. Yet, the number of conditional cooperators and the extent of conditional cooperation are much higher in the United States than anywhere else.