This seminar analyzes the relation between Ricardo, Sraffa, and Marx on the questions surrounding the theory of value. It also examines various developments of Sraffa's work and attempts to assess their theoretical and empirical significance. Readings include parts of Ricardo's Principles, Sraffa's Production of Commodities by Means of Commodities, Steedman's Marx After Sraffa, and the more recent debates between the neo-Ricardians and various Marxists.