The Political Economy of Institutions and Decisions series focuses on two central questions: How do institutions evolve in response to individual incentives, strategies, and choices, and how do institutions affect the performance of political and economic systems? The series concentrates on answers to these questions based in methodological individualism. Its scope is comparative and historical rather than international or specifically American. Its focus is positive rather than normative, but many of the studies in the series offer analyses of informal institutional factors, such as social norms and culture, based on a rational-choice approach.