Furthermore, the labor-time of a single individual is directly expressed in exchange value as _universal 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., for the satisfaction of a certain want. But the question that interests us here is as to the specific form in which labor acquires a social character. Let us suppose that a certain quantity of labor-time of a spinner is realized in 100 lbs. of yarn. Suppose 100 yards of linen, the product of the weaver, represent the 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