Frontmatter -- Contents -- Preface -- 1. Probability Theory -- 2. Bayesian Decision Theory -- 3. Game Theory: Basic Concepts -- 4. Eliminating Dominated Strategies -- 5. Pure-Strategy Nash Equilibria -- 6. Mixed-Strategy Nash Equilibria -- 7. Principal-Agent Models -- 8. Signaling Games -- 9....

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...