Duffy, J., and Ochs, J. (2006). Cooperative behavior and the frequency of social
interaction. Unpublished working paper. University of Pittsburgh.
Ellison, G. (1994). Cooperation in the prisoner's dilemma with anonymous random
matching.Prisoners’ Dilemma with Anonymous Random Matching. Review of
Economic Studies 61, 567-88.
Engle-Warnick, J. (2007). Five indefinitely repeated games in the laboratory. CIRANO,
Working Paper 2007s-11.
Engle-Warnick, J., and Slonim R. L. (2004). The evolution of strategies in a repeated
trust game. Journal of Economic Behavior and Organization 55 (4): 553-573.
Engle-Warnick, J., and R. L. Slonim R.L. (2006). Learning to trust in indefinitely
repeated games. Games and Economic Behavior 54 (1): 95-114.
Fehr, E. and S. Gaechter, S. (2002). Altruistic Punishment in Humans, Nature 415, 137-
140.
Friedman, J. W. (1971). Non-cooperative equilibrium for supergames. Review of
Economic Studies 38, 113, 1-12.
Fudenberg, D., Levine, D.K., and Pesendorfer, W. (1998). When are nonanonymous
players negligible? Journal of Economic Theory 79, 46-71.
Healy, P.J. Group reputations, stereotypes, and cooperation in a repeated labor market,
American Economic Review forthcoming
Kandori, M. (1992). Social norms and community enforcement. Review of Economic
Studies 59, 63-80.
Krasa, S., and A. Villamil (2000). Optimal contracts when enforcement is a decision
variable. Econometrica 64(1), 119-138.
Levine, D. K., and Pesendorfer, W. (1995). When are agents negligible? American
Economic Review 85, 1160-1170.
Mason, C. F., and Phillips, O.R. (2002). In support of trigger strategies: Experimental
evidence from two-person non-cooperative games. Journal of Economics and
Management Strategy 11 (4), 685-716.
Murnighan, J. K., and Roth, A.E. (1983). Expecting continued play in prisoners-dilemma
games - A test of several models. Journal of Conflict Resolution 27 (2): 279-300.
Normann, H.-T. and Wallace, B. (2006). The Impact of the Termination Rule on
Cooperation in a Prisoner’s Dilemma Experiment. working paper, Royal Holloway.
Ostrom, E., Walker, J., and Gardner, R., (1992). Covenants with and without a sword:
self governance is possible. American Political Science Review 86, 404-417.
Palfrey, T.R., and Rosenthal, H. (1994). Repeated play, cooperation and coordination: An
experimental study. Review of Economic Studies 61, 545-565.
43