Per la critica dell'economia politica

same quantity of labor-time. Inasmuch as these two products represent equal quantities of universal labor-time and, hence, are equivalents of _every_ use-value which contains the same amount of labor-time, they are also equivalent to each other. Only because the labor-time of the spinner and that of the weaver take the form of universal labor-time and their products appear as universal equivalents, is the labor of the weaver realized for the spinner, and that of the spinner, for the weaver, the labor of one takes the place of the labor of the other, i. e., the social character of their labors is realized for both. Quite different it was under the patriarchal system of production, when spinner and weaver lived under the same roof, when the female members of the family did the spinning, and the male members did the weaving to supply the wants of their own family; then yarn and linen were _social_ products, spinning and weaving were _social_ labor within the limits of the family. But their social character did not manifest itself in the fact that yarn, as a universal equivalent, could be exchanged for linen as a universal equivalent, or that one was exchanged for another, as identical and equivalent expressions of the same universal labor-time. It was rather the family organization with its natural division of labor that impressed its peculiar social stamp on the product of labor. Or, let us take the services and payments in kind of the Middle Ages. It was the specific kind of labor performed by each individual in its natural form, the particular and not the universal aspect of labor, that constituted then the social tie. Or, let us finally take labor carried on in common in its primitive natural form, as we find it at the dawn of history of all civilized races.…