Ah yes, because capitalism in it's purest form would never have companies form monopolies and lobby governments for favorable legislation.
Under True Capitalism™, cartels could do their price fixing on reality shows.
Where does capitalism mandate corruption? Yes, it is not realistic to assume there is no corruption, but capitalism in and by itself does not mandate corruption.
Obviously this all falls apart when capitalism can buy legislation. We are seeing how the USA is currently eroded by a few oligarchs.
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Is there even a government under true capitalism or is it more like the lunar anarchy described in „the moon is a harsh mistress“?