On the basis of #capitalist production, #money . . . is turned from a
given, fixed value into a self-valorizing value capable of increasing
itself. It produces #profit, i.e. it enables the capitalist to extract and
appropriate for himself a certain quantity of unpaid labour, surplus
product and surplus value. In this way, the money receives, besides the
use-value which it possesses as money, an additional use-value, namely
the ability to function as capital . . . it becomes a commodity. (#Marx
[1894]1993:459)