CHAPTER II.

the part of a measure of value. The exchange value of the commodity is estimated in money as its measure; but as exchange value, established by contract, price exists not only in the mind of the seller, but also as a measure of obligation on the part of the buyer. Besides serving as a measure of value, money plays here the part of a means of purchase, although in that capacity it only casts ahead the shadow of its future existence. It attracts the commodity from its position in the hand of the seller into that of the buyer. As soon as the term of the contract expires, money enters circulation, since it changes its position by passing from the hands of the former buyer into those of the former seller. But it does not enter circulation as a circulating medium or as a means of purchase. It performed those functions before it was present and it appears after it has ceased to perform them. It now enters circulation as the only adequate equivalent of the commodity, as the absolute form of existence of exchange value, as the last