CONTENIDO: Democracies and Dictatorships. -- Alternative Approaches. -- Classification of Political Regimes, 1950-1990. -- Basic Data about Regime Dynamics. -- The "Short" Data Base. -- Economic Development and Political Regimes. -- Dynamic Probit Model. -- Survival Models. -- Political Regimes and Economic Growth. -- Identification, Specification, and Robustness. -- Estimating the Contribution of Public Investment. -- Political Instability and Economic Growth. -- Estimating the Impact of Expectations on Economic Performance. -- Political Regimes and Population. -- Calculating Age Structure. -- Conclusion. -- Simulation. -- App. I: Selection Model. -- App. II Codebook. Incluye referencia bibliográfica (p. 301-311) e índice