Pure capitalism is unique in that it's non-political as such. (Mind you, there will be always be some political activity, because you will never find pure Capitalism, just as you will never find pure Communism.)

Slavery and feudalism I would class as specific 'political' forms of capitalism. Our modern capitalism is not pure. Wage slavery is slavery. Racial discrimination leading to lower incomes for specific ethnics is a form of modern-day feudalism, etc.