"Essays on Social Conflict and Reform" consists of four essays that study the political economy of policy reform. Social Conflict with Passive Groups examines conflicts over the distribution of income where groups that engage in appropriative activities as well as groups that are passive in this respect participate. Democratization, Rent Seeking, and Economic Transition uses a model of social conflict to determine the political and economic reform space and the economic performance in a society undergoing a transition from authoritarian rule to democracy and market economy. Constitutional Constraints and Redistributive Activities analyzes the effects of constitutional constraints against redistribution on the outcome of social conflicts. The Break-up of the Ruble Zone: Undertaking Monetary Reform while Building Democratic Institutions applies the theoretical findings of this dissertation to explain differences in monetary reform between countries in the former Soviet Union. / SITE, Stockholm Institute of Transition