explain cooperation based on rational foresight, but the "shadow of the future" offers little leverage on the problem of … cooperation emerges not from the shadow of the future but from the lessons of the past. Rule-based evolutionary models are a …

cooperation then segregation is reduced, otherwise it is increased. …

We introduce a class of two-player cooperation games where each player faces a binary decision, enter or exit. These … exiting. When the game is repeated and players' values to entry are private, cooperation admits the form of either taking … optimal symmetric cutoff strategy. These games capture the nature of cooperation in many economic and social situations such …

of those gains. Incentive contracting in these environments does not crowd-out off- equilibrium cooperation, and at high … incentive levels cooperation is crowded in. …