n this paper we propose a pluralistic and multi-dimensional ap- proach to cooperation. Specifically, we seek to show … that, in certain settings, less unconditional forms of cooperation may be combined with more gratuitous ones. Starting with … the prisoner’s dilemma game, the evolution of cooperation is analyzed in the presence of different strate- gies, which …

significantly promotes cooperation even absent negative consequences for non-cooperative behavior. We discuss the implications of … our findings for shaping institutional design to promote cooperation. …