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Money does not arise by convention, any more than the state does. It arises out of exchange, and arises naturally out of exchange; it is a product of the same.

Karl Marx (1973). “Grundrisse: Foundations of the critique of political economy”, Vintage Books USA
Money does not arise by convention, any more than the state does. It arises out of exchange, and arises naturally out of exchange; it is a product of the same.