Lecture 07: Political Economy

This lecture is the 7th session of MIT's 14.41 course "Public Finance and Public Policy," with the focus on political economy, taught by Professor Jonathan Gruber. The course background stems from the tension between economic efficiency and political reality in public policy making—why are many seemingly inefficient policies still adopted? This lecture systematically reviews the application of political economy in public finance, including core mechanisms such as voting theory, interest group influence, and rent-seeking behavior. The key highlight is Professor Gruber's clear framework explaining how "political failure" leads to policy deviating from the optimal solution, and he demonstrates the collision between theory and reality through examples such as the U.S. tax system and welfare reform. It is suitable for senior undergraduates, graduate students, and professionals studying public economics, political economy, or policy analysis to refer to and learn from. The total duration is unknown, so it is recommended to arrange viewing time appropriately; one can preview basic public economics concepts first, then take notes on cases in sync with the classroom pace, and deepen understanding by referring to the corresponding chapters in textbooks after class.