We study cooperation in economies of indefinite duration. Participants faced a sequence of prisoner’s dilemmas with anonymous opponents. We identify and characterize the strategies employed at the individual level. We report that (i) grim trigger does not describe well individual play and there is wide heterogeneity in strategies; (ii) systematic defection does not crowd-out systematic cooperation; (iii) coordination on cooperative strategies does not improve with experience. We discuss alternative methodologies and implications for theory.
Camera, G., M. Casari, and M. Bigoni (2012). Cooperative strategies in anonymous economies: An experiment. Games and Economic Behavior 75, 570–586. doi: 10.1016/j.geb.2012.02.009