The requisites of production being labor, capital, and land, it has been seen from the preceding chapter that the impediments to the increase of production do not arise from the first of these elements. But production has other requisites, and, of these, the one which we shall next consider is Capital. There can not be more people in any country, or in the world, than can be supported from the produce of past labor until that of present labor comes in [although it is not to be supposed that capital consists wholly of food]. We have next, therefore, to inquire into the conditions of the increase of capital: the causes by which the rapidity of its increase is determined, and the necessary limitations of that increase. Since all capital is the product of saving, that is, of abstinence from present consumption for the sake of a future good, the increase of capital must depend upon two things—the amount of the fund from which saving can be made, and the strength of the dispositions which prompt to it. (1.) The fund from which saving can be made is the surplus of the produce of labor, after supplying the necessaries of life to all concerned in the production (including those employed in replacing the materials, and keeping the fixed capital in repair). More than this surplus can not be saved under any circumstances. As much as this, though it never is saved, always might be. This surplus is the fund from which the enjoyments, as distinguished from the necessaries of the producers, are provided; it is the fund from which all are subsisted who are not themselves engaged in production, and from which all additions are made to capital. The capital of the employer forms the revenue of the laborers, and, if this exceeds the necessaries of life, it gives them a surplus which they may either expend in enjoyments or save. It is evident that the whole unproductive consumption of the laborer can be saved. When it is considered how enormous a sum is spent by the working-classes in drink alone (and also in the great reserves of the Trades-Unions collected for purposes of strikes), it is indisputable that the laborers have the margin from which savings can be made, and by which they themselves may become capitalists. The great accumulations in the savings-banks by small depositors in the United States also show somewhat how much is actually saved. In 1882-1883 there were 2,876,438 persons who had deposited in the savings-banks of the United States $1,024,856,787, with an average to each depositor of $356.29. The unproductive consumption, however, of all classes—not merely that of the working-men—is the possible fund which may be saved. That being the amount which _can_ be saved, how much _will_ be saved depends on the strength of the desire to save.