labor-time, and this universal character of individual labor is the manifestation of its social character. The labor-time represented by exchange value is the labor-time of an individual, but of an individual undistinguished from other individuals in so far as they perform the same labor; therefore, the time required by one individual for the production of a certain commodity is the necessary labor-time which any other individual would have to spend on the production of the same commodity. It is the labor-time of an individual, his labor-time, but only as labor-time common to all, regardless as to which particular individual's labor-time it is. As universal labor-time it is represented in a universal product, in a universal equivalent, in a definite quantity of materialized labor-time; the latter is indifferent as to the particular form of use-value in which it appears directly as the product of an individual, and may be turned at will into any other form of use-value to represent the product of any other individual. Only as such a universal quantity, is it a social quantity. In order to result in exchange value, the labor of an individual must be turned into a universal equivalent, i.e., the labor-time of an individual must be expressed as universal labor-time, or universal labor-time as that of an individual. It is the same as though different individuals had put together their labor-time and contributed the different quantities of labor-time at their common disposal in the form of different use-values. The labor-time of the individual is thus, in fact, the labor time which society requires for the production of a certain use-value, i.e.,
