From profit margins to income distribution: Joan Robinson's odyssey from marginal productivity theory

The point of departure for this paper is a 1941 Note on profit margins co-authored by Joan Robinson and Nicholas Kaldor that remained unpublished until 2000. Robinson's reviews of Henry Clay's The Problem of Industrial Relationships, Bresciani Turroni's The Economics of Inflation, and Roy Harrod's Towards a Dynamic Economics, along with her 1965 Cambridge Inaugural Lecture, may be interpreted as analogous documents that develop her critique of neoclassical wage theory and identify the money wage as the economy's ‘key’ price. These publications were critical steps toward the wage mark-up hypothesis and Post-Keynesian support of incomes policy to contain inflation. Robinson's Harrod review anticipated her later ideas about economic growth. With Kalecki's notion of ‘the degree of monopoly’ and her own concept of neo-mercantilism (from the Inaugural Lecture), these themes are nascent in the Robinson–Kaldor Note on profit margins.