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The study of institutions, a core concept in comparative politics, has produced many rich and influential theories on the economic and political effects of institutions, yet it has been less successful at theorizing their origins. In Fixing Democracy, Javier Corrales develops a theory ofinstitutional origins that concentrates on constitutions and levels of power within them. He reviews numerous Latin American constituent assemblies and constitutional amendments to explore why some democracies expand rather than restrict presidential powers and why this heightened presidentialismdiscourages democracy. His signal theoretical contribution is his elaboration on power asymmetries. Corrales determines that conditions of reduced power asymmetry make constituent assemblies more likely to curtail presidential powers, while weaker opposition and heightened power asymmetry is anindicator that presidential powers will expand. The bargain-based theory that he uses focuses on power distribution and provides a more accurate variable in predicting actual constitutional outcomes than other approaches based on functionalism or ideology. While the empirical focus is Latin America,Fixing Democracy contributes a broadly applicable theory to the scholarship both institutions and democracy.