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Originally, the conversion of the product into money in the sphere of circulation appears only as an individual necessity for the commodity owner in so far as his own product has no use-value to him, but has to acquire it first by being alienated. But in order to pay at the expiration of the contract, he must have sold commodities before that. Thus, entirely apart from his individual wants, the movement of the circulation process makes selling a social necessity with every owner of commodities. As a former Pg 191buyer of a commodity he is compelled to become a seller of another commodity in order to get money not as a means of purchase but as a means of payment, as the absolute form of exchange value. The conversion of commodity into money as a final act, or the first metamorphosis of a commodity as an end in itself which in the case of hoarding seemed to be a matter of caprice on the part of the commodity owner, becomes now an economic function. The motive and essence of sale for the sake of payment becomes from a mere form of the process of circulation its self emanating substance.

In this form of sale the commodity completes its change of position; it circulates while it postpones its first metamorphosis, viz. its transformation into money. On the contrary, on the part of the buyer the second metamorphosis is completed, i. e. money is reconverted into a commodity before the first metamorphosis has taken place, i. e., before the commodity has been turned into money. The first metamorphosis thus takes place after the second in point of time; and thereby, money i. e. the form of the commodity in its first metamorphosis, acquires a new destination. Money or the spontaneous development of exchange value, is no longer a mere intermediary form of the circulation of commodities, but its final result.

That such time sales in which the two poles of the sale are separated in point of time, have their natural origin in the simple circulation of commodities, requires no elaborate proof. In the first place, the development of circulation leads to a continual repetiPg 192tion of the mutual transactions between the same commodity owners who confront each other as seller and buyer. The repetition is not accidental; on the contrary, goods are ordered, let us say, for a certain date in the future when they are to be delivered and paid for. In that case the sale is ideal, i. e. it is legally accomplished without the actual presence of the goods and money. Both forms of money, those of a medium of circulation and of a means of payment still coincide here, since in the first place, commodity and money change places simultaneously, and secondly, the money does not buy the commodity, but realizes the price of the commodity purchased before. In the second place, the nature of a great many use-values makes the simultaneous alienation and delivery of the goods impossible, and delivery has to be postponed for a certain time; e. g., when the use of a house is sold for one month, the use-value of the house is delivered only at the expiration of the month, although it changes hands at the beginning of the month. Since the actual transfer of the use-value and its virtual alienation are separated here in point of time, the realization of its price occurs also after its change of place. Finally, the difference in the seasons and in the length of time required for the production of various commodities brings about a situation where one tries to sell his goods, while the other is not ready to buy; and with the repeated purchases and sales between the same commodity owners the two ends of sale fall apart according to the conditions of production of the respective commodities. Thus arises a relation of creditor and debtor betweenPg 193 the owners of commodities which, though constituting the natural foundation of the credit system, may be fully developed before the latter comes into existence. It is clear that with the extension of the credit system, and, consequently, with the development of the capitalist system of production in general, the function of money as a means of payment will extend at the expense of its function as a means of purchase and, still more, as an element of hoarding. In England, e. g., money as coin has been almost completely banished into the sphere of retail and petty trade between producers and consumers, while it dominates the sphere of large commercial transactions as a means of payment.105

As the universal means of payment money becomes the universal commodity of all contracts, at first only in Pg 194the sphere of circulation of commodities.106 But with the development of this function of money, all other forms of payment are gradually converted into money payments. The extent to which money is developed as the exclusive means of payment indicates the degree to which exchange value has taken hold of production in its depth and breadth.107

The volume of money in circulation, as a means of payment, is determined in the first place, by the amount of payments, i. e. by the sum total of the prices of the commodities alienated, but not about to be alienated, as Pg 195in the case of the simple circulation of money. The quantity thus determined is subject, however, to two modifications. The first modification is due to the rapidity with which the same piece of money repeats the same function, i. e. with which the several payments succeed one another. A pays B, whereupon B pays C, and so forth. The rapidity with which the same coin repeats its function as a means of payment, depends first, upon the continuity of the relation of creditor and debtor among the owners of commodities, the same commodity owner being the creditor of one person and the debtor of another, etc., and secondly, upon the interval which separates the times of various payments. This chain of payments or of supplementary first metamorphoses of commodities is qualitatively different from the chain of metamorphoses which is formed by the circulation of money as a circulating medium. The latter not only makes its appearance gradually, but is even formed in that manner. A commodity is first converted into money, then again into a commodity, thereby enabling another commodity to become money, etc.; or, seller becomes buyer, whereby another commodity owner turns seller. This successive connection is accidentally formed in the very process of the exchange of commodities. But when the money which A has paid to B is passed on from B to C, from C to D, etc., and that, too, at intervals rapidly succeeding one another, then this external connection reveals but an already existing social connection. The same money passes through different hands not because it appears as a means of payment; it passes as a means of payPg 196ment because the different hands have already clasped each other. The rapidity with which money circulates as a means of payment thus shows that individuals have been drawn into the process of circulation much deeper than would be indicated by the same rapidity of the circulation of money as coin or as a means of purchase.

The sum total of prices made up by all the purchases and sales taking place at the same time, and, therefore, side by side, constitutes the limit for the substitution of the volume of coin by the rapidity of its circulation. If the payments that are to be made simultaneously are concentrated at one place—which naturally arises at first at points where the circulation of commodities is largest—the payments balance each other as negative and positive quantities: A is under obligations to pay B, while he has to be paid by C. etc. The quantity of money required as a means of payment will, therefore, be determined not by the total amount of payments which have to be made simultaneously, but by the greater or less concentration of the same and by the magnitude of the balance remaining after their mutual neutralization as negative and positive quantities. Special arrangements are made for settlements of this kind even where the credit system is not developed at all, as was the case e. g. in ancient Rome. The consideration of these arrangements, however, as well as that of the general time limits of payment, which are everywhere established among certain elements in the community, does not belong here. We may add that the specific influence which these time settlements exert on thePg 197 periodic fluctuations in the quantity of money in circulation, has been scientifically investigated but lately.