Medida invariable de los valores y la teoría de David Ricardo sobre la mercancía

This article presents a recent interpretation of ricardian price theory. Some of Piero Sraffa's contributions allow us to show some important equivocations in Karl Marx's reading of Ricardo's theory and, also, the analytical brake between the marxist approach and its classical predecessor. Finally, assuming a hypothesis of reproduction and a rule for the distribution of physical surplus, the concept of "production difficulty" is proposed to capture the specific characteristics of the ricardian commodities discourse.