Page:Contribution to the Critique of Political Economy, A - Karl Marx.djvu/215

Rh confine ourselves to summing up the most essential points.

Since universal labor-time admits of quantitative differences only, the object which is to serve as its specific incarnation must be capable of representing purely quantitative differences, i. e., it must be homogeneous and uniform in quality throughout. That is the first condition a commodity must satisfy to perform the function of a measure of value. If commodities were estimated in oxen, hides, grain, etc., they would really have to be estimated in an ideal average ox, or average hide, since there are qualitative differences betwenbetween [sic] an ox and an ox, grain and grain, hide and hide. On the contrary, gold and silver, as elementary substances, are always the same, and equal quantities of them represent, therefore, values of equal magnitude. The other condition which a commodity that is to serve as a universal equivalent must satisfy and which follows directly from its function of representing purely quantitative differences, is that it must be capable of being divided and re-united at will, so that money of account may be represented