The quantity theory conflicts with the capitalization theory. The quantity theory as presented by Fisher conflicts with the capitalization theory as presented by Fisher. Which theory is true? Would prices rise thus, or would they be held down in some way by the limitations on the quantity of money? I hold that I have already proved, in the reasoning given in connection with my hypothetical island, and in the case of the South with its cotton, that the capitalization theory tendency would prevail. The prices of products rise, and then the prices of the labor, land, and other capital goods which have produced them, rise, the rise in the prices of the capital goods behaving in accordance with the laws of the capitalization theory, and all of the rises after the initial rise in products being in accordance with the imputation theory of the Austrians. This conflict suggests an interesting point. Various elements in our economic theory, added from time to time by different writers, have necessarily come from different philosophical and sociological view-points, and have behind them different philosophical, psychological, and sociological assumptions. The quantity theory, developing, as shown in the chapter on "Supply and Demand and the Value of Money," largely in isolation from the general body of economic theory, has a background of psychological and sociological assumptions quite different from that of many other doctrines. In the chapter on "Dodo-Bones," I stated these assumptions. The quantity theory rests in a psychology of blind habit. It assumes a rigidity in the social system such that it might be likened to a machine, with a hopper into which money is poured, which grinds out prices at the other end. I set this in contrast with the psychological assumptions underlying the commodity theory of money. That theory rests on the "banker's psychology." It assumes a highly reflective and calculating attitude on the part of economic men, with the disposition to look behind appearances for the security, to test things out, to get to bedrock in business affairs. Now the capitalization theory likewise assumes this banker's psychology. In its refinements, as represented by the mathematical formulae in the appendices of Fisher's _Rate of Interest_, it assumes a degree of precision in business calculation which few experts in bond departments apply, and which the highly fluid and alert dealers in Wall Street certainly have not time for, even if they had that degree of mathematical knowledge! In practice, it need not be said, particularly in the case of the prices of lands, the capitalization theory finds its predictions very imperfectly realized! But the two theories, resting in such divergent psychological assumptions, may be expected, _a priori_, to conflict. That they do conflict is not remarkable.