Page:Contribution to the Critique of Political Economy, A - Karl Marx.djvu/83

gold as the measure of value, implies however, that every single commodity is measured in gold, in proportion to the labor-time contained in both; that the actual common measure of the commodity and of gold is labor; or that commodity and gold are passed for each other in direct barter as equal exchange values. How this equalization actually takes place, can not be discussed here when treating of simple circulation. So much, however, is clear, that in countries producing gold and silver, certain quantities of labor-time are directly embodied in definite quantities of gold and silver, while in countries which do not produce gold and silver the same result is reached in a round-about way, by direct or indirect exchange of the commodities of those countries; i. e. a definite portion of average national labor is given for a definite quantity of labor-time, embodied in the gold and silver of the mine-owning countries. In order to be able to serve as a measure of value, gold must be as far as possible a variable value, because it can become the equivalent of other commodities only as an incarnation of labor-time, and the same labor-time is realized in unequal volumes of use-values with the change in the productive power of concrete labor. In estimating all commodities in gold it is only assumed that gold represents a given quantity of labor at a given moment, as was done when the exchange value of any commodity was expressed in terms of the use-value of any other commodity. As for the variations of the value of gold, the law of exchange value formulated above holds good in its case as well. If the exchange value of commodities remains unchanged, then a general rise in their gold