Group Size and Cooperation among Strangers
We study how group size affects cooperation in an infinitely repeated n-player Prisoner's Dilemma (PD) game. In each repetition of the game, groups of size n less than or equal to M are randomly and anonymously matched from a fixed population of size M to play the n-player PD stage game. We provide conditions for which the contagious strategy (Kandori, 1992) sustains a social norm of cooperation among all M players. Our main finding is that if agents are sufficiently patient, a social norm of society-wide cooperation becomes easier to sustain under the contagious strategy as n converges to M.
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- Ellison, Glenn, 1994.
"Cooperation in the Prisoner's Dilemma with Anonymous Random Matching,"
Review of Economic Studies,
Wiley Blackwell, vol. 61(3), pages 567-88, July.
- Glen Ellison, 2010. "Cooperation in the Prisoner's Dilemma with Anonymous Random Matching," Levine's Working Paper Archive 631, David K. Levine.
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- Pedro Bó, 2007.
"Social norms, cooperation and inequality,"
Springer, vol. 30(1), pages 89-105, January.
- Okada, Akira, 1993. " The Possibility of Cooperation in an n-Person Prisoners' Dilemma with Institutional Arrangements," Public Choice, Springer, vol. 77(3), pages 629-56, November.
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