In this paper I study conditions for the emergence of cooperative behavior in a dynamic model of population interaction. The model has finitely many individuals located on a circle. The pay- off of each individual is partly based on the (local) interaction with neighbors and partly on (uniform) interaction with the whole population. The dynamics is driven by imitative behavior. I show that for a large class of parameters cooperation will emerge if the population is large; if the population is small, defection will prevail in the long run. The result contrasts with conventional wisdom which says that the larger the population, the less likely cooperation will be.

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Tinbergen Institute Discussion Paper Series
Tinbergen Institute

Janssen, M.C.W. (2000). Imitation of Cooperation in Prisoner's Dilemma Games with Some Local Interaction (No. TI 00-019/1). Tinbergen Institute Discussion Paper Series. Retrieved from