> The user in question, begins with assumptions on how wealth and markets work that do not match anything I know of in economics.

I'm not surprised. My dad taught free market economics as a professor in his later years. Students would come up to him shocked that there was a case for free markets.

May I recommend any of Milton Friedman's books. Or "Capitalism" by Reisman. https://www.amazon.com/Capitalism-Treatise-Economics-Vol-1/d...

> in a market economy there is no theft

A free market economy is based on no force or fraud, and the government's job is to enforce that.

> wealth concentration does not occur.

Correct, in a free market.