commodities as a particular exclusive commodity, is money. Money is a crystallization of the exchange value of commodities which they themselves form in the process of exchange. Thus, while commodities become use-values to each other in the process of exchange by casting off all definite forms and entering into mutual relations in their direct material shape, they must assume a new form, viz., proceed to the formation of money in order to appear as exchange values to each other. Money is not a symbol, no more than the commodity aspect of a use-value is a symbol. That a social relation of production takes the form of an object existing outside of individuals, and that the definite relations into which individuals enter in the process of production carried on in society, assume the form of specific properties of a thing, is a perversion and by no means imaginary, but prosaically real, mystification marking all social forms of labor which creates exchange value. In money this mystification appears only more strikingly than in commodities.
The necessary physical properties of the particular commodity in which the money form of all other commodities is to be crystallized—as far as they are directly determined by the nature of exchange