Capital, Volume Three: The Process of Capitalist Production as a Whole by Karl Marx

An exhaustive analysis of the credit system and of the instruments which it creates for its own use (credit-money, etc.) lies beyond our plan. We merely wish to dwell here upon a few particular points, which are required to characterise the capitalist mode of production in general. We shall deal only with commercial and bank credit. The connection between the development of this form of credit and that of public credit will not be considered here.

I have shown earlier (Buch I, Kap. III, 3, b [English edition: Ch. III, 3, b. – Ed.]) how the function of money as a means of payment, and therewith a relation of creditor and debtor between the producer and trader of commodities, develop from the simple circulation of commodities. With the development of commerce and of the capitalist mode of production, which produces solely with an eye to circulation, this natural basis of the credit system is extended, generalised, and worked out. Money serves here, by and large, merely as a means of payment, i.e., commodities are not sold for money, but for a written promise to pay for them at a certain date. For brevity's sake, we may put all these promissory notes under the general head of bills of exchange. Such bills of exchange, in their turn, circulate as means of payment until the day on which they fall due; and they form the actual commercial money. Inasmuch as they ultimately neutralise one another through the balancing of claims and debts, they act absolutely as money, although there is no eventual transformation into actual money. Just as these mutual advances of producers and merchants make up the real foundation of credit, so does the instrument of their circulation, the bill of exchange, form the basis of credit-money proper, of bank-notes, etc. These do not rest upon the circulation of money, be it metallic or government-issued paper money, but rather upon the circulation of bills of exchange.