> what's not nonsense is to view humans as rational beings, and the free market as the perfect system.

> What it says is that economists should include more psychology and less mathematics in their theories.

Those are some really groundbreaking ideas, I can't believe no one has thought of that before.

https://en.wikipedia.org/wiki/Behavioral_economics

Of course some people thought of this. That's explanained in the article

I've yet to meet an economist who doesn't accept bounded rationality (as opposed to the idea that people are perfectly rational).