A materialist take on this is also that advances in technology made slavery a useless institution towards maximizing the interests of capitalists and that permi

A materialist take on this is also that advances in technology made slavery a useless institution towards maximizing the interests of capitalists and that permitted its withering away. Slavery was a market for people in themselves, but the proletariat is a market for their labor power. Labor power is superfluous in form. This change in institutions brought about by the possibilities of technological advancements kept the rates of profit up and made slavery null in advanced countries. Similar to serfdom.