Having worked at four separate Wall Street firms, having seen a variety of talent at those places, and having competed against Goldman as a banker, one thing you have to be struck by is the power of their recruiting.

Is there any fairness in a system where a group of people can borrow a bunch of money to buy a company and pay themselves millions of dollars in dividends and fees, while the company itself ends up bankrupt and its employees lose their jobs, health insurance and pensions?

Generally speaking, they have as many stars as other firms, but they are low-key about it, because that's not the Goldman way, but their bench is a lot deeper. I think Goldman has as many A players, but more importantly they have fewer C players. And no firm, I have noticed, has the depth anywhere like that.

People are pretty simple: they do what they are rewarded for doing. If they get multimillion-dollar bonuses by taking huge risks with other people's money - as they still do - then they will continue to take those huge risks, and not give it another thought.

Because I wrote a book about Goldman Sachs. And I know that, from talking to people at Goldman Sachs, that Trump is the poster child for the kind of client they don't want to do business with, mainly because he would borrow all this money from Wall Street to build his casinos, and then didn't pay it back.