It would be easy to elaborate the points in which morals, laws, and economic values are alike, and to show in detail that the theory of economic value is merely a special case of the general theory of social value. For our present purposes, however, it is enough to have illustrated the general doctrine, and to have set up the economic values as true social forces. It may be noticed that the effort to differentiate the different kinds of value is not altogether successful. They are not in watertight compartments in social life. It is a commonplace among students of ethics that moral values grow, in greater or less degree, out of economic factors. Indeed, the "economic interpretation of history" has as its central theme the doctrine that morality, law, and ideal values in general are governed by the economic situation. This is a one-sided view. Moral and legal values are influenced and modified by economic forces. Legal and moral values do, in part, derive their power from economic values. But on the other hand, economic values likewise derive part of their power from legal and moral values. The "social mind" is an organic whole, in which no factors exist "pure," and in which there is constant give and take. The effort to explain moral values by a single principle, as sympathy, legal values by another simple principle, as fear, and economic values by a different simple principle, as utility, is foredoomed. It has been given up by the students of law and morals, and should be abandoned by the students of economics.