Series Foreword -- Preface -- I Introduction -- 1 Moral Sentiments and Material Interests: Origins, Evidence, and Consequences -- II The Behavioral Ecology of Cooperation -- 2 The Evolution of Cooperation in Primate Groups -- 3 The Natural History of Human Food Sharing and Cooperation: A Review and a New Multi- Individual Approach to the Negotiation of Norms -- 4 Costly Signaling and Cooperative Behavior -- III Modeling and Testing Strong Reciprocity -- 5 The Economics of Strong Reciprocity -- 6 Modeling Strong Reciprocity -- 7 The Evolution of Altruistic Punishment -- 8 Norm Compliance and Strong Reciprocity -- IV Reciprocity and Social Policy -- 9 Policies That Crowd out Reciprocity and Collective Action -- 10 Reciprocity and the Welfare State -- 11 Fairness, Reciprocity, and Wage Rigidity -- 12 The Logic of Reciprocity: Trust, Collective Action, and Law -- 13 Social Capital, Moral Sentiments, and Community Governance -- Contributors -- Index.