On the contrary. It's a quote mocking the extent to which the exploitative system of capitalism has entrenched itself in the minds of people, to such a degree that they cannot even consider that a better alternative might exist.
https://en.m.wikipedia.org/wiki/Capitalist_Realism
By the way, buying and selling things isn't generally considered to be capitalism. Capitalism is about controlling private property for the generation of profit.
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