Large Format Projectionist#BennJordan has an excellent hypothesis on yootoob using Marx's definition of abstract and concrete work. tl;dr- to follow
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Concrete work is already successfully exploited by corporate-persons in capitalism. It's what you're paid to do.
Abstract work is the stuff you do for you, and usually, pretty well. This is barely exploited in things like paid time for personal projects in hope they yield the Next Big Thing.