A great deal of capital, which appears to-day in the United States without any certificate of birth, was yesterday, in England, the capitalised blood… - Karl Marx

The commodity is first of all, an external object, a thing which through its qualities satisfies human needs of whatever kind. The nature of these needs, whether they arise, for example, from the stomach, or the imagination, makes no difference. Nor does it matter here how the thing satisfies man's need, whether directly as a means of subsistence, i.e. an object of consumption, or indirectly as a means of production

These numerous points at which money is withdrawn from circulation and accumulated in numerous individual hoards or potential money-capitals appears as so many obstacles to circulation, because they immobilise the money and deprive it of its capacity to circulate for a certain time.

A circuit performed by a capital and meant to be a periodical process, not an individual act, is called its turnover. The duration of this turnover is determined by the sum of its time of production and its time of circulation.