" Reflection on the forms of human life, hence also scientific analysis of those forms, takes a course directly opposite to their real development…Consequently, it was solely the analysis of the prices of commodities which led to the determination of the magnitude of value, and solely the common expression of all commodities in money which led to the establishment of their character as values. It is however precisely this finished form of the world of commodities—the money form—which conceals the social character of private labour and the social relations between the individual workers, by making those relations appear as relations between material objects, instead of revealing them plainly. (168–9) "

― David Harvey , A Companion to Marx's Capital