In this lecture, part of Yale instructor Paul North's chapter by chapter study of Marx's Capital, Volume 1, the course examines how far productivity can be pushed to extract additional surplus value and how Marx proposes calculating the rate of exploitation of labor. North then transitions into Chapters 17 through 20, addressing Marx's definition of the wage and how it functions within the capitalist system. The session bridges the course's earlier chapters on surplus value with its upcoming material on accumulation and reproduction, continuing the close, sequential reading of the 1872 text that structures the entire course.