This is what I mean when I say that capitalism is a system in which some people own the power to permit or deny others to labor productively.
Individual capitalists are often abusive, but they rarely own the formal right to directly extract wealth from subordinates, the way feudal lords did. Instead, they must exploit through purely economic means alone—their ownership of property (physical, financial, intellectual, and whatever) that allows them to allow or deny others to labor productively.
While any one capitalist might not have that much power over you, they do, as a class, effectively own your life.
I’ll close with this passage from Friedrich Engels, who was problematic for all sorts of reasons I won’t get into here but did summarize this particular dynamic really well:
“The only difference as compared with the old, outspoken slavery is this, that the worker of today seems to be free because he is not sold once for all, but piecemeal by the day, the week, the year, and because no one owner sells him to another, but he is forced to sell himself in this way instead, being the slave of no particular person, but of the whole property-holding class. For him the matter is unchanged at bottom, and if this semblance of liberty necessarily gives him some real freedom on the one hand, it entails on the other the disadvantage that no one guarantees him a subsistence, he is in danger of being repudiated at any moment by his master, the bourgeoisie, and left to die of starvation, if the bourgeoisie ceases to have an interest in his employment, his existence.”
10/end