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The Proletariat and the Problem of Unproductive Labor
(www.youtube.com)
A Marxist economist from Cambridge wrote a good summary of how services fit into Marxist theory (summary: it's not a useful category for Marx)
https://www.repository.cam.ac.uk/items/971d2c5b-b98d-4b0c-9934-03265a752041
For the study of Marxism, and all the tendencies that fall beneath it.
Read Lenin.
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