of human labor in general. In so far as they have a use value for other people they can be exchanged; in so far as they all possess the common quality of human labor in general, they can be mutually compared in exchange by means of this labor. In two similar products under identical social conditions there may be unequal amounts of private labor, but equal amounts of human labor in general. An unskillful smith might take as long to make five horeshoes as it would take a skillful smith to make ten. But society does not fix the price according to accidental lack of skill of the one, it recognises only human labor in general, the human labor of the ordinary normal skilled smith. Each of the five horseshoes then made by the first does not have any more value than each of the other ten which were made in the same time as the five. Only so far as is socially necessary does private labor comprehend human labor in general.
Therefore I maintain that a commodity has a certain value, 1st. because it is a socially useful product, 2nd. because it is produced by a private individual for private profit, 3d. because while it is a product of private labor, it is, at the same time, unconsciously and involuntarily a social product and exchanges socially according to a definite social standard. 4th. this standard is not expressed in terms of labor, in so many hours, but in another commodity. If, therefore, I say that this clock is worth this piece of cloth and that they are both worth fifty marks, I say that in the clock, the cloth and the gold there is an equal amount of social labor. I also affirm that the amounts of social labor time in them are socially measured and found to be equal, not directly and absolutely however, as one measures labor time in hours or days, but in a round about fashion, relatively, by
