ABSTRACT
It has to be admitted that the interest in the discussion of the fundamental concepts of economic theory is out of fashion. It would seem that economics is exclusively devoted to collecting the quantitative reflections of empirical phenomena by means of mathematical functions. There is no need to investigate too hard to find them. In fact, Keynes stresses the close link between these theoretical questions and the other elements in his argument once and again, as if to persuade the reader that they are important; however, in light of the debate that followed the publication of his book, it should be said that his performance in this terrain was far from successful. For the classical theory, the rate of interest is determined by the "real" forces that operate on the capital market, and just as wages are the retribution of the "labor factor", the rate of interest is the retribution of the "capital factor".
