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In the sale C—M, as well as in the purchase M—C, two commodities, entities of exchange value and use-value, confront each other, but the exchange value of the commodity exists only ideally as price; while as regards gold, although it is really a use-value, its use-Pg 112value is confined only to its being the bearer of exchange value and is, therefore, merely a formal use-value, having no relation to a real individual want. The antithesis of use-value and exchange value is thus distributed at the two extreme poles of C—M, so that the commodity confronts gold as a use-value which has yet to realize in gold its exchange value or its price, while gold confronts the commodity as an exchange value, whose formal use-value is yet to be realized in the commodity. Only through this duplication of the commodity as commodity and gold, and, further, through the twofold and polar relation by virtue of which each extreme represents but ideally what its opposite is in reality and is in reality what its opposite is only ideally—in short, only through the appearance of commodities as two-sided polar opposites are the contradictions solved that are inherent in the process of exchange.

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 samePg 113 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 forPg 114 gold as a commodity, as a particular embodiment of labor-time; but in so far as it is the price that is realized in gold, the commodity is exchanged for gold in its capacity of money and not of a commodity, i. e., it is exchanged for gold as a universal embodiment of labor-time. But in either case the quantity of gold for which the commodity is exchanged in the process of circulation is not determined by exchange, but the exchange is determined by the price of the commodity, i. e., by its exchange value estimated in gold.67

Within the process of circulation gold appears in everybody's hands as the result of sale C—M. But since C—M, sale, is at the same time M—C, purchase, it is apparent that while C, the commodity from which the process starts, is passing through its first metamorphosis, another commodity, which confronts it as the opposite pole M, is completing its second metamorphosis and is, therefore, passing through the second phase of circulation, while the first commodity is still in the first phase of its course.

As a result of the first phase of circulation, the sale, we get money which is the starting point of the second phase. In place of the commodity in its first form appears its golden equivalent. This result may now form a resting point, since the commodity in this second form Pg 115possesses a lasting existence of its own. The commodity, a non-use-value in the hands of its possessor, is now on hand in an always useful, since always exchangeable, form, and it depends upon circumstances when and at what point of the surface of the commodity world it will again enter circulation. Its formation into a gold chrysalis constitutes an independent period in its life which may last a greater or less length of time. While in the case of barter the exchange of one particular use-value is directly bound up with the exchange of another particular use-value, the universal character of labor which creates exchange value is manifested in the separation and lack of coincidence of acts of purchase and sale.

M—C, purchase, is the inverted movement of C—M and at the same time the second or final metamorphosis of the commodity. As gold, i. e., in the form of the universal equivalent, the commodity can be directly represented in the use-values of all other commodities; the latter aspire to gold as their hereafter, but at the same time indicate in their prices the key in which it must sound in order that their bodies, their use-values, may take the place of money, while their souls, their exchange-values, may enter gold. The universal product of the alienation of commodities is the absolutely alienable commodity. There is no qualitative and only a quantitative limit to the transformation of gold into commodity, namely, the limit of its own quantity or magnitude of its value. "Everything is to be had for cash." While in the movement C—M, the commodity, through its alienation as a use-value, realizes its ownPg 116 price and the use-value of somebody else's money; it realizes in the movement M—C, through its alienation as an exchange value, its own use-value and the price of the other commodity. While through the realization of its price the commodity transforms gold into actual money, it turns gold into its merely fleeting money-form, through its own retransformation. Since the circulation of commodities implies an extensive division of labor and consequently a diversity of wants on the part of individuals, a diversity which bears an inverse ratio to the specialization of their own products, the purchase M—C may appear as an equation with one commodity equivalent or split up into a series of commodity-equivalents limited by the variety of the demands of the purchaser and by the amount of money in his possession. Just as a sale is a purchase, so is a purchase a sale. M—C is at the same time C—M, but the initiative belongs in this case to gold or the purchaser.