From Karl Marx’s Critique of Political Economy (1859): “Direct barter, the spontaneous form of exchange, signifies the beginning of the transformation of use-values into commodities rather than the transformation of commodities into money. Exchange-value does not acquire an independent form, but is still directly tied to use-value. This is manifested in two ways. Use-value, not exchange-value, is the purpose of the whole system of production, and use-values accordingly cease to be use-values...
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