I've seen several thought experiments about capitalism, and letting it run to its extreme conclusion.
Attempt one, with the theoretical best starting conditions, devolved into feudalism
Attempt two, which assumed people knew how attempt one ended up and where they wanted to do everything they could to prevent that from happening again, concluded towards theocracy, since capitalism ignores religion, which can become a coercive power structure, separate from capitalism or government.
Attempt three, where everyone knew how the previous two experiments went, did away with money, and replaced it with an economy based on service contracts, evolved into communism.
More likely viewing. I'll update the previous post in a minute.
And I'll have to stress: it's specifically about anarcho-capitalism, with the explicit removal of any government. You'll keep hearing far-right conservatives insist that the best way to run the market is to keep the government out of it. Anarcho-capitalsim is that thing's platonic ideal, no need to wonder about the government being involved if there's no government involved.
As you'll see, at best that causes way more problems than a governed system causes. At worst, it creates a load of problems that a governed system prevents.