Only one adult in a hundred gets his food and clothing without doing anything directly in exchange for them. The other ninety-nine form active parts of the system of relations in society which will be called, in what follows here, economic; and even the one in the hundred who does not give, takes something, as children and imbeciles take, out of the store of services which are economic life. Boots and bread are but the bridges over which one man is connected with another, through services exchanged. The philosophy of social life, therefore, must “place” these economic relations in the whole complex unity of human experience. The science of economics analyses some of the aspects of the relations of men in exchanging services, and it provides a language which is already sufficiently current to be used here without full explanation of the terms. Therefore, without more ado, the philosophical aspects of the economic system may be considered in the terms of economic science, but outside the frontiers proper to that partial analysis.