This study investigates whether cooperation in an indefinitely repeated prisoner's dilemma is sensitive to the complexity of cooperative strategies. An experimental design which allows manipulations of the complexity of these strategies by making either the cooperate action or the defect action...

We study cooperation in economies of indefinite duration. Participants faced a sequence of prisonerʼs 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...