With profits this inquiry has manifestly nothing to do. We want to find what it is that determines the division of their joint produce between land, labor, and capital; and profits is not a term that refers exclusively to any one of these three divisions. Of the three parts into which profits are divided by political economists—namely, compensation for risk, wages of superintendence, and return for the use of capital—the latter falls under the term interest, which includes all the returns for the use of capital, and excludes everything else; wages of superintendence falls under the term wages, which includes all returns for human exertion, and excludes everything else; and compensation for risk has no place whatever, as risk is eliminated when all the transactions of a community are taken together. I shall, therefore, consistently with the definitions of political economists, use the term interest as signifying that part of the produce which goes to capital. To recapitulate: Land, labor, and capital are the factors of production. The term land includes all natural opportunities or forces; the term labor, all human exertion; and the term capital, all wealth used to produce more wealth. In returns to these three factors is the whole produce distributed. That part which goes to land owners as payment for the use of natural opportunities is called rent; that part which constitutes the reward of human exertion is called wages; and that part which constitutes the return for the use of capital is called interest. These terms mutually exclude each other. The income of any individual may be made up from any one, two, or all three of these sources; but in the effort to discover the laws of distribution we must keep them separate. * * * * *