Intro -- Title -- Contents -- Preface to the Second Edition -- 1 Equilibrium, Efficiency, and Asymmetric Information -- 2 Basic Models and Tools -- 3 Hidden Action -- 4 Corporate Governance -- 5 Hidden Characteristics -- 6 Auctions -- 7 Voting and Preference Revelation -- 8 Public Goods and...

Human groups maintain a high level of sociality despite a low level of relatedness among group members. The behavioral basis of this sociality remains in doubt. This paper reviews the evidence for an empirically identifiable form of prosocial behavior in humans, which we call "strong...