> So basically creating a strawman toy model of actual complex economy and solving it

Uh, no. Read up on what economists did to empirically study and fix the kidney market and how many lives that has saved. (before you start typing, no, it wasn't to sell kidneys to the highest bidder)

> rational agent axiom

If you knew anything about economics, you'd know that no economist subscribes to any "rational agent axiom". But you have made up a strawman in your head so enjoy poking sticks at it.