Reader Manuel Angeles commented: “In Cambridge (UK) in the 1970s, a whole slew of them rejected marginalist theory. Joan Robinson, in fact, frequently ridiculed it, in spite of Keynes´s chapter in the General Theory.”
Angeles refers to the so-called Cambridge Capital Controversy, which pitted economists from Cambridge, Mass., led by Paul Samuelson against Cambridge UK-based economists led by the Italian-British economist Piero Sraffa (1898-1983). Paul Samuelson (1915-2009), who was considered perhaps the leading (bourgeois) U.S. economist of his generation, defended marginalist theory. Samuelson combined marginalism with a watered-down Keynesianism that he called the “Grand Neoclassical Synthesis.”
Sraffa and his supporters clearly came out on top against the Samuelson-led marginalists. Sraffa’s attack on marginalism is contained in his short book “Production of Commodities by Means of Commodities,” where he exposed logical and mathematical paradoxes in marginalist theory.
But what value theory did Sraffa and his generally left Keynesian supporters propose in place of marginalism? Nothing, really, beyond that, given free competition, prices will tend toward levels where capitals of equal size earn equal profits in equal periods of time. The Sraffians also claimed that, with a given level of productivity of labor, wages and “interest rates”—by which is meant the rate of profit—will vary inversely.
Whatever he may have thought in private about the labor value schools of Ricardo and Marx—Sraffa was a great admirer and scholar of Ricardo and was well acquainted with Marxism having been a sympathizer of the Italian Communist Party in his youth—”neo-Ricardian” followers of Sraffa’s work have often used it against Marx’s labor value and surplus value theory. Once we accept the “neo-Ricardian” “price of production school” in place of Marxist value theory, we are forced to draw the conclusion that constant capital—machines and raw materials—as well as land produce value and surplus value.