> If there is no benefit for humans as investors, markets won't exist.

This is so breathtakingly wrong, that 'Earth is flat' is more accurate.

Ten thousand years ago, before investors, central banks, before currency, before the concept of money, primitive people had Markets

Primordial market consists only of two peope - labourer and a customer. I trade my sheep for your fish.

Even in the modern day, many companies have no investors - for example limited partnerships.

The idea that markets would disappear without investment reads like an attempt by the pope to take credit for creating the world in 3 days.