all the money (and therefore power) was in the hand of rational rich people.

This is the real point of econ. It's all about justifying inequalities.

Under their ideology the rational become rich and thus the most rich must be the most rational. And don't we want the world to be run by the most rational? Or do you want want those poor, gross, irrational agents?

It's an overt grift indicative of the deep rot in capitalist ideology.