An authoritative textbook based on the legendary economics course taught at the University of Chicago—now fully updated and expanded Price theory is a powerful analytical tool kit for measuring, explaining, and predicting market outcomes. This expanded second edition of Chicago Price Theory offers a unique approach to the subject, emphasizing hands-on, practical applications that can help students adeptly integrate economic theory with real-world forces. A key distinction is its focus on market equilibrium and gains from trade. Unlike many microeconomics texts, this book emphasizes how, through markets, households and businesses adapt to conditions like price controls and externalities. It modernizes the Marshallian idea of forward-falling supply, especially for analyzing human capital, and makes use of the cost function and Hicks-Marshall laws to analyze a variety of economic phenomena. Rooted in Chicago’s price theory tradition, this textbook enables students to understand human behavior through the lens of price theory, showing how a small set of well-mastered tools makes it possible to analyze a remarkably wide range of economic questions. Now includes a full chapter closely integrating economic reasoning with the treatment-control paradigm - Covers topics such as occupational choice, the evolution of inequality, the value of a statistical life, prohibition, and competition - Uses the economics of “nudges” to understand business contracts and the organization of civil society - Features analysis of business-to-business transactions - Discusses the future implications of artificial intelligence - Comes with lesson plans for minicourses in industrial organization, health economics, macroeconomics, labor, public finance, and urban economics - Accompanied by video lectures taught by Kevin M. Murphy, Gary Becker, Casey B. Mulligan, and Robert Minton "A tremendous resource. This comprehensive and innovative book brings together in one great package the Chicago way of thinking about price theory." —Douglas A. Irwin, author of Free Trade Under Fire “This excellent book captures the essence of the University of Chicago’s unique approach to economics education. It uses many modern examples to demonstrate that price theory is a powerful tool for understanding human behavior.” —Matthew E. Kahn, Johns Hopkins University Sonia Jaffe is a research economist at Microsoft. Robert Minton is an economist in the Prices and Wages section at the Federal Reserve Board. Casey B. Mulligan is professor of economics at the University of Chicago. Kevin M. Murphy is the George J. Stigler Distinguished Service Professor of Economics Emeritus at the University of Chicago.