Learning in finitely repeated games of cooperation remains poorly understood in part because their dynamics play out … over a timescale exceeding that of traditional lab experiments. Here, we report results of a virtual lab experiment in … majority of rational players. These results shed hopeful light on the long-term dynamics of cooperation, and demonstrate the …

way to enforce cooperation in groups is ostracism: players who defect are expelled. If the group's members prefer not to … threat in doubt. Nonetheless, we show that ostracism can be effective in promoting cooperation with either finite or infinite …