The greeks tried running their fledgling states with their merchant class and failed miserably. That's why Plato said in effect if you run your government (republic) with merchants you are asking for big troubles. He also said pure democracies will bankrupt themselves when they figure out they can vote themselves the state's treasury. Hence, his concepts of the Republic and having a class of people steeled over a lifetime of different experiences before they can govern. The Romans tended to be good at that too.
Now we have failed baseball and oil well owners ruining things. And lifelong politicians who haven't earned an honest days wages in their lives. We desparately need term limits. And teachers and nurses and plumbers on the Supreme Court. (yeah, i said it. But it beats having worthless attorneys debating how many angels dance on the head of a pin.)