CHAPTER II.

So far we have considered C—M as sale, as the conversion of commodity into money. But if we look at it from the other end, the same process will assume the form M—C, or purchase, i. e., the conversion of money into commodity. Sale is necessarily its opposite at the same time; it is the former if we look at the process from one end, and the latter if we regard the process from the other end. In practice this process differs only in that the initiative in C—M originates at the commodity end or with the seller, while in M—C it comes from the money end or the buyer. In describing the first metamorphosis of the commodity, its conversion into money as a result of the completion of the first phase of circulation C—M, we assume at the same 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