Sort of.
Gawker posted a chart of his fluctuating net worth. Objective estimates had it in negative territory in 1988 and the early 1990s. If somebody makes market returns for himself and his investors, I’d say they were competent in business. If your partners take a bath and you wind up in the black, I’d say you were good at negotiation. Or self-promotion. Not business. That’s a wider skill set. Mitt Romney was good at business. I’m not so sure about Donald Trump.
http://gawker.com/donald-trumps-grossly-exaggerated-net-worth-a-timeline-1711718182