material wealth; in short, to labor in so far as it produces use-values. In assuming that a commodity has use-value we assume the special usefulness and distinct fitness of the labor absorbed by it, but that is all there is to the view of labor as useful labor from the standpoint of commodity. Considering bread as a use-value, we are interested in its properties as an article of food and not at all in the different kinds of labor of the farmer, miller, baker, etc. If by some invention nineteen-twentieths of this labor could be saved, the loaf of bread would still render the same service as before. If it fell ready-made from the sky it would not lose a single atom of its use-value. While labor which creates exchange value is realized in the equality of commodities as universal equivalents, labor as a productive activity with a useful purpose is realized in the endless variety of use-values created by it. While labor which creates exchange values is abstract, universal and homogeneous, labor which produces use-values is concrete and special and is made up of an endless variety of kinds of labor according to the way in which and the material to which it is applied.
It is wrong to speak of labor in