This brings us to the second sense in which property is social. There is a social element in value and a social element in production. In modern industry there is very little that the individual can do by his unaided efforts. Labour is minutely divided; and in proportion as it is divided it is forced to be co-operative. Men produce goods to sell, and the rate of exchange, that is, price, is fixed by relations of demand and supply the rates of which are determined by complex social forces. In the methods of production every man makes use, to the best of his ability, of the whole available means of civilization, of the machinery which the brains of other men have devised, of the human apparatus which is the gift of acquired civilization. Society thus provides conditions or opportunities of which one man will make much better use than another, and the use to which they are put is the individual or personal element in production which is the basis of the personal claim to reward. To maintain and stimulate this personal effort is a necessity of good economic organization, and without asking here whether any particular conception of Socialism would or would not meet this need we may lay down with confidence that no form of Socialism which should ignore it could possibly enjoy enduring success. On the other hand, an individualism which ignores the social factor in wealth will deplete the national resources, deprive the community of its just share in the fruits of industry and so result in a one-sided and inequitable distribution of wealth. Economic justice is to render what is due not only to each individual but to each function, social or personal, that is engaged in the performance of useful service, and this due is measured by the amount necessary to stimulate and maintain the efficient exercise of that useful function. This equation between function and sustenance is the true meaning of economic equality.