The Law of Value: capitalist production is the production of "an immense multitude of commodities" or generalised commodity production. A commodity has two essential qualities firstly, they are useful, they satisfy some human want, "the nature of such wants, whether, for instance, they spring from the stomach or from fancy, makes no difference"[19] and secondly they are sold on a market or exchanged. Critically the exchange value of a commodity "is independent of the amount of labour required to appropriate its useful qualities".[19] However, rather depends on the amount of socially necessary labour required to produce it.