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The central argument of Capital is that the motivating force of capitalism is in the exploitation of labour, whose unpaid work is the ultimate source of surplus value and profit.
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"The law, in its majestic equality, forbids the rich as well as the poor to sleep under bridges, to beg in the streets, and to steal bread."
https://en.wikipedia.org/wiki/Das_Kapital#Legacy
My hypothesis is that if you go full socialism, you get stagnation, because no one is motivated to change anything. If you go full capitalism, you get Gilded Age, where wealth and political power is concentrated in the hands of few individuals, followed by Great Depression.
Healthy state is in the middle.
Under capitalism, man exploits man. Under socialism, it's the other way around!
Myself, I always exploited my employers by extracting money from them.