This question was originally directed to the project by e. ahmet Tonak, Anwar Shaikh, and Sungur Savran: Empirical Measurement of Labour Theory Of Value Categories. But I think my question has a more general significance and I changed the title of my question. The following question is the original one.

Are you thinking that prices of commodities are proportional to their embodied labor? If not, what are you planning to do?

After the long debate on transformation problem, it seems useless efforts to attempt to prove that labor contents are proportional to prices. Single system interpretation is an abandonment of labor theory of value. You may explain exploitation but it is not already a theory of value. You may dress a table of national accounting on the base of labor hours, but you cannot explain how and why such and such things happened in the real capitalist economy. You may have much more important things to do in understanding capitalism.

If you want to make reconciliation with Marx's thought, the following comment by Lyudmila Vashina on Rubin's book would be suggesting:

  • Rubin came to the following conclusion: the main part of Marx's theory of value is not the proof that the value of a commodity depends on the quantity of labor expended in the production of the commodity, but the understanding that production relations of commodity capitalist economy inevitably take the value form and the labour is expressed only in values. It is wrong to think, Rubin insists, that, starting from value phenomena of things, Marx arrived as a result of analysis to the conclusion that the common thing was labor as a result of analysis to the conclusion (This kind of problem setting was seen among precursors of Marx). According to Rubins's interpretation, Marx's process of thinking was essentially the converse. The "private" labor of individual producers can be transformed into social labor only through the value of their labor products. (Excerpt from Lyudmina Vashina's paper Rubin and his manuscript which was attached to Rubins's book Outline of Monetary Theory of Marx (2011) in Russian edited by her; my translation from the Japanese translation by Susumu Takenaga)
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