I think the fact that Elon Musk it the most successful entrepreneur in the world is a testament to the contrary. And that being a successful businessperson has nothing to do with merit or skill, but a lot more to do with happenstance, and former wealth.

Our public policy on the global market has been neo-liberalism on full steam, the rich are getting richer, not because business people are getting smarter, but because government is deregulating exploitation as a matter of public policy. Somebody is bound to become extremely rich in this environment, and it just so happens that the people getting extremely rich are either the ones that exploit workers (i.e. Jeff Bezos) or the ones that fool rich investors (i.e. Elon Musk).