The development of marginal analysis and the theory of markets and the study of general equilibrium have made fundamental contributions to our understanding of the economic behaviour and facts that surround us and in which we are immersed. They are not sufficient. We must investigate the underlying determinants of economic phenomena.
The advances by Keynes and Sraffa beyond microeconomic analysis, with one considering aggregate quantities and the other the value relationships between wages and goods, directly seek to understand the variables of greatest importance for the welfare of society. The ancient themes of commutative justice and distributive justice maintain all their relevance.