strategies which support cooperation in one group only. These last strategies have the property that cheating on the agreement in … the cooperative group is followed by non-cooperation in this group and cooperation in the rival group. The main conclusion … is that the set of parameters for which cooperation can be sustained within the larger group as a subgame perfect outcome …

We study how the willingness to enter long-term bilateral relationships affects cooperation even when parties have … little information about each other, ex ante, and cooperation is otherwise unenforceable. We experimentally investigate a … research, longer interactions facilitate cooperation. However, many individuals avoid long-term commitment, with uncooperative …