Building rational cooperation on their own: Learning to start small

We report experimental results for a twice‐played prisoners' dilemma in which the players can choose the allocation of the stakes across the two periods. Our point of departure is the assumption that some (but not all) people are willing to cooperate, as long as their opponent is sufficiently likely to do so. The presence of such types can be exploited to enhance cooperation by structuring the twice‐played prisoners' dilemma to “start small,” so...