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Since owners of commodities give the products of their individual labor the appearance of products of social labor by turning one object, viz. gold, into the direct expression of universal labor-time and therefore into money, their own movement by which all of them effect the interchange of the material products of their labor now appears to them as the direct movement of that one object, as the circulation of gold. The social movement itself appears to the owners of commodities partly as an outward necessity and partly as a mere formal intermediary process which enables every individual who puts any use-value into circulation to get other use-values out of it of an equal value. The use-value of commodities comes into play with their disappearancePg 130 from the sphere or circulation, while the use-value of money as a medium of circulation is in its very circulation. The movement of a commodity in the sphere of circulation is of a transitory kind, while ceaseless motion in that sphere constitutes the function of money. Through this special function which it performs within the sphere of circulation money acquires a new capacity, which we have to consider now more closely.

In the first place, we see that the circulation of money forms an endlessly split up movement, since it reflects the splitting up of the process of circulation into an infinitely large number of purchases and sales and the independent separation of the mutually supplementary phases of metamorphoses of commodities. In the small cycles described by money, where the starting and returning points coincide, we do find a return movement, i. e., an actual circular movement, but the fact that there are as many starting points as there are commodities and that the number of these cycles is infinitely large puts them beyond all control, measurement, or computation. The time between the start and the return of a commodity is just as indefinite. Moreover, it is immaterial whether or not such a circuit has been actually described in a given case. No economic fact is more generally known than that one can spend money with one hand without getting it back with the other. Money proceeds from an endless number of points and returns to as many different points, but the coincidence of the starting and returning points is a matter of chance, because in the movement C—M—C the turning of the buyer again into a seller is not a necessary condition. Still less does thePg 131 circulation of money resemble a movement radiating from a common centre to all points of the periphery and back from the peripheral points to the centre. The so-called cycle described by money, as it is pictured, amounts simply to this, that at all points we observe its appearance and disappearance, its never ceasing transition from place to place. In a higher, more involved form of money circulation, e. g. bank-note circulation, we shall find that the conditions of emission of money include those for its return. But in the simple money circulation it is a matter of chance for the same buyer to become again a seller. Where we really see constant cycle motions taking place, they are only reflections of deeper forces in the sphere of production, e. g., the manufacturer draws money from his banker on Friday, pays it out to his working-men on Saturday, the men immediately pay out the greater part of it to the storekeepers, etc., and the latter turn it in on Monday back to the banker.

We have seen that money realizes simultaneously a certain number of prices in the variegated purchases and sales which take place side by side at the same time. On the other hand, in so far as its movement represents the movement of the combined metamorphoses of commodities and the interlacing of these metamorphoses, the same coin realizes the prices of different commodities and thus makes a larger or smaller number of moves. If we take the circulation of a country for a given length of time, say a day, the quantity of gold required for the realization of prices and, consequently, for the circulation of commodities, will be determinedPg 132 by two conditions: first, the sum total of the prices; second, the average number of moves made by one coin. This number of moves or the rapidity of circulation of money is in its turn determined by or expresses the average rapidity with which commodities go through the different phases of their metamorphoses, the rapidity with which these metamorphoses succeed one another, and with which those commodities that have gone through their metamorphoses are replaced by new commodities in the process of circulation. We have seen that in the process of the determination of prices the exchange value of all commodities is ideally converted into a certain quantity of gold of the same value and that the same amount of value is present in a double form in either of the isolated acts of circulation M—C and C—M, first embodied in the commodity, and second, in gold; yet gold enjoys the capacity of a medium of circulation not by virtue of its isolated relation to separate commodities in a state of rest, but owing to its active presence in the dynamic world of commodities, viz., its function of expressing the change of form of commodities by its change of place and expressing the rapidity of their change of form by the rapidity of its change of place. The extent to which it is present in the sphere of circulation, i. e., the actual quantity of gold in circulation, is thus determined by the extent to which it is discharging its function throughout the entire process.

The circulation of money implies the circulation of commodities; money circulates commodities which have prices, i. e., which are beforehand ideally equated to certain quantities of gold. In the determination of thePg 133 prices of commodities, the value of the quantity of gold which serves as a unit of measure, or the value of gold, is assumed to be given. Under that assumption the quantity of gold necessary for circulation is determined first of all by the sum total of the prices of commodities that are to be realized. But this sum is itself determined: 1. By the level of prices, the relatively high or low exchange value of commodities estimated in gold; and 2. By the mass of commodities circulating at fixed prices, i. e. by the number of purchases and sales at given prices.73 If one quarter of wheat is worth 60 shillings, then twice as much gold is required to circulate it or to realize its price as would be the case if it were worth only 30 shillings. To circulate 500 quarters of wheat at 60 shillings, twice as much gold is necessary as for the circulation of 250 quarters at the same price. Finally, to circulate 10 quarters at 100 shillings only half as much money is necessary as when circuPg 134lating 40 quarters at 50 shillings. It follows that the quantity of gold required for circulation may fall in spite of a rise in price, if the mass of commodities in circulation declines in a greater ratio than the rise of the combined sum of prices; and, inversely, the quantity of the circulating medium may rise in spite of a decline of the mass of commodities in circulation, if the sum total of prices rises in a greater ratio. Thorough and minute English investigations have demonstrated e. g. that in the early stages of a dearth of grain in England the quantity of money in circulation increases, because the total price of the diminished supply of grain is greater than the former total price of a larger supply of grain, while the circulation of the other commodities continues undisturbed for some time at their old prices. At a later stage of the dearth of grain, there is a decline in the quantity of circulating money, either because less goods are sold at old prices besides grain, or the same quantity of those goods is sold at lower prices.