ABSTRACT
Non-Marxist economists no longer talk about the distribution of income among social classes but about the functional distribution of income, the return per unit to each of the economic factors of production that performs a function in the productive process. A single theory, the marginal productivity theory, in value terms, covers all. Every productive input will be paid according to its marginal value product. The question to be raised here is with respect to a "proof' of the marginal productivity distribution theory itself.
