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Third, value is not the same thing as exchange-value (or price). Rather, the value is the shared characteristic of the exchange-values of all the commodities. He calls this the "common factor", whereas someone else might call it the "essence". In contrast, the exchange-value represents the appearance or "form" of expression of value in trade.
That is, the classical political economists failed theoretically to reconcile the law of value with unequal exchange (the exchange of unequal values). For Marx, the exchange of non-equivalents was not an aberration in the exchange process at all, but instead the pivot of business competition among producers in capitalist society.
Mirowski (1989) for example accuses Marx of vacillating between a field theory (labour-time currently socially necessary) and a substance theory of value (embodied labour-time). This kind of criticism is due to a confusion of the process of labour in general (adding use to a product, which under capitalism equates adding value to a commodity ...
This is reflected both at the general level of lack of understanding of the social nature of technological change embodied in Marx's theory of the value-form, reflected in widespread ignorance of the detail of the "rational kernel" of Hegel's dialectic [7] whose the principal 'forms of being' Marx used to structure the whole of the work on ...
In Marx's theory, a commodity is something that is bought and sold, or exchanged in a relationship of trade. [4] It has value, which represents a quantity of human labor. [5] Because it has value, implies that people try to economise its use. A commodity also has a use value [6] and an exchange value. [7]
Marx concludes that as value is determined by labour, and as profit is the appropriated surplus value remaining after paying wages, that the maximum profit is set by the minimum wage necessary to sustain labour, but is in turn adjusted by the overall productive powers of labour using given tools and machines, the length of the workday, the ...
Exchange-value is a key concept in understanding Marx's analysis of commodities. Every commodity has a dual nature: use-value (its utility) and exchange-value (its value in the market). Exchange-value is determined by the amount of socially necessary labor time required to produce a commodity, rather than its physical usefulness. [138]
Value is, on the other hand, a measure of a commodity's worth in comparison to other commodities. It is closely related to exchange-value, the ratio at which commodities should be traded for one another, but not identical: value is at a more general level of abstraction; exchange-value is a realisation or form of it.