Sraffa’s price equations in light of Garegnani and Pasinetti. The “core” of surplus theories and the “natural” relations of an economic system

Within the rich literature that has flowed from Sraffa’s framework of Production of Commodities by Means of Commodities, a prominent position is occupied by the research programmes developed independently by two authoritative exponents of this school: Pierangelo Garegnani and Luigi Pasinetti. Certain specific features of their approaches might lead one to see them as alternatives to one another. Yet, when analysed from a constructive perspective, one discovers not only a common origin and methodology, but also strict complementarity in their analysis of the main characteristics of industrial systems.