Page:Contribution to the Critique of Political Economy, A - Karl Marx.djvu/119

time that another commodity has been converted into money and is now in its second phase of circulation, M—C. Thus we get into a vicious circle of assumptions. Circulation itself constitutes such a vicious circle. If we did not consider M in M—C as the result of a metamorphosis of another commodity, we would thereby take exchange out of the process of circulation. But outside of the latter the form C—M disappears and only two different Cs confront each other, say iron and gold, the exchange of which does not constitute a part of the process of circulation, being direct barter. Gold, at the source of its production, is a commodity like any other commodity. Its relative value and that of iron or of any other commodity is expressed here in quantities in which they are mutually exchanged. But in the process of circulation this operation is implied, the value of gold being already given in the prices of commodities. Nothing can, therefore, be more erroneous than the idea that gold and commodity enter into the relation of direct barter within the process of circulation and that their relative values are ascertained through their exchange as simple commodities. The illusion that gold is bartered as a simple commodity for other commodities in the process of circulation is due to the fact that prices represent equations in which certain quantities of commodities are made equal to certain quantities of gold, i. e., that the commodities are made to relate to gold in its capacity of money, as a universal equivalent, and, therefore, appear to be directly exchangeable for it. In so far as the price of a commodity is realized in gold, it is exchanged for