> markets have successfully run the entire global economy for thousands of years
Markets, as they are understood today, are more like about 300 years old, even less in some places. The bulk of world economy has been sustenance farming for most of the human history, with some communal mutual help (based on favours and mutual indebtedness) thrown in.
> with no central oversight and almost no regulation
Lol what? E.g. Roman Republic (and later empire) tightly regulated its markets, especially food trade, during all of its existence.