Political economy examines how politics and economics shape public policy. This field applies economic tools to analyze political decision-making, assuming individuals act in their self-interest. Key concepts include rent-seeking, logrolling, and the median voter theorem. Public choice theory, a major component of political economy, challenges the idea of government as a benevolent entity. It argues that politicians, bureaucrats, and voters respond to incentives, which can lead to government failure and inefficient outcomes.