In evolutionary models of indirect reciprocity, reputation mechanisms can stabilize cooperation even in severe cooperation problems like the prisoner's dilemma. Under certain circumstances, conditionally cooperative strategies, which cooperate iff their partner has a good reputation, cannot be...

Using a repeated public good game with stranger matching, we compare how two different reputation systems with endogenous evaluations affect rates of cooperation. Contributions are public information and each participant evaluates her partner's contribution. At the beginning of each period,...