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Marx’s value theory is not aimed at deriving relative prices (Marx explicitly says so in a number of places). It is primarily designed to explain the mechanisms by which a working class which produces the value receives so little of it

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Good. Having worked in corporate pricing I know that price bears no relation to cost. It’s a pity we measure both with the same unit ($). Causes endless confusion.

and is thereby condemned to live and work under such appalling conditions in the midst of astonishing privatized affluence. In other words, the value theory is about the production and reproduction of class relations, not about relative price formation.

is there any mapping with the "dominance" concept in ecology? I am currently digging in the community ecology literature, and I find "dominance" and "evenness" and I wonder if there has been any attempt to line up the machineries formalisms. It seems to me it's not well settled in Ecology either :S

Relative prices are, nevertheless, derived from his analysis. It can be seen in Chapter 50 of Book III "Illusions created by competition" (where: W, r, prices, interact). Productive labour can be explicitly determined with sraffian "basic commodities" P. Sraffa clarifies both aspects.