What appears duplicated here, is 1) the outlay of money as capital, and 2) its reflux as realized capital, as M' or M+DM.
In the movement of merchant's capital, M — C — M', the same commodity changes hands twice, or more than twice, if merchant sells to merchant. But every such change of place of the same commodity indicates a metamorphosis, a purchase or sale of the commodity, no matter how often the process may be repeated, until it enters consumption.
On the other hand, the same money changes hands twice in C — M — C, but this indicates the complete metamorphosis of the commodity, which is first converted into money and then from money back into another commodity.
But in interest-bearing capital the first time M changes hands is by no means a phase either of the commodity metamorphosis, or of reproduction of capital. It first becomes one when it is expended a second time, in the hands of the active capitalist who carries on trade with it, or transforms it into productive capital. M's first change of hands does not express anything here, beyond its transfer from A to B — a transfer which usually takes place under certain legal forms and stipulations.
This double outlay of money as capital, of which the first is merely a transfer from A to B, is matched by its double reflux. As M', or M + DM, it flows back out of the process to B, the person acting as capitalist. The latter then transfers it back to A, but together with a part of the profit, as realized capital, as M + DM, in which DM is not the entire profit, but only a portion of the profit — the interest. It flows back to B only as what he had expended, as functioning capital, but as the property of A. To make its reflux complete, B must consequently return it to A. But in addition to the capital, B must also turn over to A a portion of the profit, a part which goes under the name of interest, which he had made with this capital since A had given him the money only as a capital, i.e., as value which is not only preserved in its movement, but also creates surplus-value for its owner. It remains in B's hands only so long as it is functioning capital. And with its reflux — on the stipulated date — it ceases to function as capital. When no longer acting as capital, however, it must again be returned to A, who had never ceased being its legal owner.
The form of lending, which is peculiar to this commodity, to capital as commodity, and which also occurs in other transactions instead of that of sale, follows from the simple definition that capital obtains here as a commodity, or that money as capital becomes a commodity.
Commodities loaned out as capitalare loaned either as fixed or as circulating capital, depending on their properties. Money may be loaned out in either form. It may be loaned as fixed capital, for instance, if it is paid back in the form of an annuity, whereby a portion of the capital flows back together with the interest.
The manner of reflux is, therefore, always determined by the actual circuit described by capital in the act of reproduction and by its specific varieties. But as for loaned capital, its reflux assumes the form of return payments, because its advance, by which it is transferred, possesses the form of a loan.
The loaned capital flows back in two ways. In the process of reproduction it returns to the functioning capitalist, and then its return repeats itself once more as transfer to the lender, the money-capitalist, as return payment to the real owner, its legal point of departure.
The loaning capitalist gives away his capital, transfers it to the industrial capitalist, without receiving any equivalent. His transfer is not an act belonging to the real circulation process of capital at all. It serves merely to introduce this circuit, which is effected by the industrial capitalist. This first change of position of money does not express any act of the metamorphosis — neither buying nor selling. Ownership is not relinquished, because there is no exchange and no equivalent is received. The return of the money from the hands of the industrial capitalist to those of the loaning capitalist merely supplements the first act of giving away the capital. Advanced in the form of money, the capital again returns to the industrial capitalist through the circular process in the form of money. But since it did not belong to him when he invested it, it cannot belong to him on its return. Passing through the process of reproduction cannot by any means turn the capital into his property. He must therefore restore it to the lender. The first expenditure, which transfers the capital from the lender to the borrower, is a legal transaction which has nothing to do with the actual process of reproduction. It is merely a prelude to this process. The return payment, which again transfers the capital that has flowed back from the borrower to the lender is another legal transaction, a supplement of the first. One introduces the actual process, the other is an act supplementary to this process. Point of departure and point of return, the giving away and the recovery of the loaned capital, thus appear as arbitrary movements promoted by legal transactions, which take place before and after the actual movement of capital and have nothing to do with it as such. It would have been all the same as concerns this actual movement if the capital had from the first belonged to the industrial capitalist and had returned to him, therefore, as his own.
In the actual movement of capital its return is a phase in the process of circulation. The money is first converted into means of production; production transforms them into commodities; through sale of the commodities they are reconverted into money and return in this form into the hands of the capitalist who had originally advanced the capital in the form of money. But in the case of interest-bearing capital, the return, like alienation, is the result of a legal transaction between the owner of the capital and a second party. We see only the alienation and the return payment. Whatever passes in the interim is obliterated.
But since money advanced as capital has the property of returning to the person who advanced it, to the one who expended it as capital, and since M — C — M' is the immanent form of the movement of capital, the owner of the money can, for this very reason, loan it out as capital, as something that has the property of returning to its point of departure, of preserving, and increasing, its value in the course of its movement. He gives it away as capital, because it returns to its point of departure after having been employed as capital, hence can be restored by the borrower after a certain period precisely because it has come back to him.
Loaning money as capital — its alienation on the condition of it being returned after a certain time-presupposes, therefore, that it will be actually employed as capital, and that it actually flows back to its starting-point. The real cycle made by money as capital is, therefore, the premise for the legal transaction by which the borrower must return the money to the lender. If the borrower does not use the money as capital, that is his own business. The lender loans it as capital, and as such it is supposed to perform the functions of capital, which include the circuit of money-capital until it returns to its starting-point in the form of money.
The acts of circulation, M — C and C — M', in which a certain amount of value functions as money or commodities, are but intermediate processes, mere phases of the total movement. As capital, it performs the entire movement M — M'. It is advanced as money or a sum of values in one form or another, and returns as a sum of values. The lender of money does not expend it in purchasing commodities, or, if this sum of values is in commodity-form, does not sell it for money. He advances it as capital, as M — M', as a value, which returns to its point of departure after a certain term. He lends instead of buying or selling. This lending, therefore, is the appropriate form of alienating value as capital, instead of alienating it as money or commodities. It does not follow, however, that lending cannot also take the form of transactions which have nothing to do with the capitalist process of reproduction.
