" The extension of exchange puts producers into relations of reciprocal dependency. But they relate to each other by way of the products they exchange rather than directly as social beings. Social relationships are expressed as relationships between things. On the other hand, the things themselves exchange according to their value, which is measured in terms of abstract labour. And abstract labour becomes the measure of value through a specific social process. The 'fetishism of commodities' describes a state in which 'the relations connecting the labour of one individual with that of the rest appear, not as direct social relations between individuals at work, but as what they really are, material relations between persons and social relations between things' (Capital, vol. 1, p. 73). "

― David Harvey , The Limits to Capital