A must read in social theory and materialist philosophy even though the economics presented in this book are not in all aspects up to date with contemporary economics. Marx takes a clear normative stance towards the arrangement of economic production: you should earn what you work for. The capitalist mode of production inherently violates this premise by allowing capital to appropriate all surplus value (i.e. all the produced value by labor power beyond the value necessary for the reproduction of the worker). Marx believed that all produced value — and value according to the economic understanding from his time comes strictly from labor — should go to the worker because he has worked for it and the capitalist didn't. Surplus appropriation is seen as exploitation because it represents produced value that the wages do not cover and the capitalist therefore does not pay for. It is not entirely clear to me how Marx views the risk taken by the capitalist for exposing his capital to losses or how his moral claims would stand in relation to current day economic theory of supply and demand. His economic normative stance is therefore less appealing to me although it makes intuitive sense.
More interestingly are his views on the relationship of power between the worker and capital and the role of technology within it. Technological advancement plays a vital role in the conflict between worker and capitalist as it does not only cause production and product improvement but also shifts and consolidations of power relations. Formerly, the worker used technology as an object for his productive process. But technology introduced real subsumption and inverted the relationship between worker and technology making the machine the subject and the worker the object in the production process. We do not need to look far for radicalized real world examples: Amazon warehouse workers use production machinery, surveillance technology, algorithmic decision making and much more to force production speed norms, internalized management gazes, skill dependence, co-worker alienation—all to squeeze out absolute and relative surplus value from its workers necessary for capital expansion. Popular answers to such cases point to the freedom the worker holds to change jobs. The worker is, however, condemned to nature’s necessities and the veil of economic transaction between labor and capital hides the unfreedom with which labor comes to negotiate the transaction with capital. But the point is stronger than that, for capitalism has, built-in, a mechanism that continuously makes the worker dependent, less skilled or even obsolete. To do this, it needs to absorb the skills and knowledge of the worker and materialize this in the machine that propels production. The machine comes to dominate the production process and rule over the worker; the machine, representing capital's demand, subjects the worker as a conscious organ through which capital accumulates itself. It is for these reasons that — and this is the most important and relevant insight of the book I believe — “It would be possible to write a whole history of the inventions made since 1830 for the sole purpose of providing capital with weapons against working-class revolt”.