This book proposes a simple framework for understanding the political economy of subsidy reform and applies it to four in-depth country studies covering more than 30 distinct episodes of reform. Five key lessons emerge. First, energy subsidies often follow a life cycle, beginning as a way to stabilize prices and reduce exposure to price volatility for low-income consumers. However, as they grow in size and political power, they become entrenched. Second, subsidy reform strategies vary because the underlying political economy problems vary.