one's type or group) on cooperation in a standard prisoner's dilemma environment. Subjects can repeatedly choose between … viscosity leads to a sharp increase in overall cooperation rates and in addition positively affects the subjects' intrinsic …

interactions, direct and indirect reputation and memory constraints that is crucial for the emergence of cooperation. Taken by … itself, none of these mechanisms is sufficient to yield cooperation. …

prosocialnorms. The main findings are that strict norms, sustained by stronginternal punishment, need either viscosity or strong … (high viscosity) leads to monomorphic equilibria with strict normsfor cooperation. And one of integration (low viscosity …) where intermediatenorms persist in polymorphic equilibria. Furthermore, with endogenous norms,viscosity and cooperation are …

cooperation may arise as workers learn positively about their own skills. We then build a model for team managers and establish … that their objectivity in assessing coworkers' abilities may facilitate cooperation among agents. This is the case because … their level of ability. We show that insufficient cooperation may arise as workers learn positively about their own skills …