We are, of course, not speaking of particular wages and particular interest, but of the general rate of wages and the general rate of interest, meaning always by interest the return which capital can secure, less insurance and wages of superintendence. In a particular case, or a particular employment, the tendency of wages and interest to an equilibrium may be impeded; but between the general rate of wages and the general rate of interest, this tendency must be prompt to act. For though in a particular branch of production the line may be clearly drawn between those who furnish labor and those who furnish capital, yet even in communities where there is the sharpest distinction between the general class laborers and the general class capitalists, these two classes shade off into each other by imperceptible gradations, and on the extremes where the two classes meet in the same persons, the interaction which restores equilibrium, or rather prevents its disturbance, can go on without obstruction, whatever obstacles may exist where the separation is complete. And, furthermore, it must be remembered, as has before been stated, that capital is but a portion of wealth, distinguished from wealth generally only by the purpose to which it is applied, and, hence, the whole body of wealth has upon the relations of capital and labor the same equalizing effect that a fly-wheel has upon the motion of machinery, taking up capital when it is in excess and giving it out again when there is a deficiency, just as a jeweler may give his wife diamonds to wear when he has a superabundant stock, and put them in his showcase again when his stock becomes reduced. Thus any tendency on the part of interest to rise above the equilibrium with wages must immediately beget not only a tendency to direct labor to the production of capital, but also the application of wealth to the uses of capital; while any tendency of wages to rise above the equilibrium with interest must in like manner beget not only a tendency to turn labor from the production of capital, but also to lessen the proportion of capital by diverting from a productive to a non-productive use some of the articles of wealth of which capital is composed. To recapitulate: There is a certain relation or ratio between wages and interest, fixed by causes, which, if not absolutely permanent, slowly change, at which enough labor will be turned into capital to supply the capital which, in the degree of knowledge, state of the arts, density of population, character of occupations, variety, extent and rapidity of exchanges, will be demanded for production, and this relation or ratio the interaction of labor and capital constantly maintains; hence interest must rise and fall with the rise and fall of wages.