The worst loophole is what Donald Trump has talked about: the tax deductibility of interest. If you let real estate owners or corporate raiders borrow the money to buy a property or company, and then pay interest to the bondholders, you'll load the company you take over with debt. But you don't have to pay taxes on the profits that you pay out in this way. You can deduct the interest from your tax liability.

Small banks that lend to consumers are fine.

The concept of productivity in America is income divided by labor. So if you're Goldman Sachs and you pay yourself $20 million a year in salary and bonuses, you're considered to have added $20 million to GDP, and that's enormously productive. So we're talking in a tautology. We're talking with circular reasoning here.

No price is too high to pay to try to make the financial system go on a little bit longer. But ultimately it can't be saved, because of the mathematics that are involved.

What's bad for the frackers usually is good for the rest of the world.

As you have to pay more interest and amortization on what you owe, you're left with less and less money to buy goods and services - unless you borrow even more and go further into debt.

When you buy enough stocks to give you control of a target company, that's called mergers and acquisitions or corporate raiding. Hedge funds have been doing this, as well as corporate financial managers. With borrowed money you can take over or raid a foreign company too. So, you're having a monopolistic consolidation process that's pushed up the market, because in order to buy a company or arrange a merger, you have to offer more than the going stock-market price. You have to convince existing holders of a stock to sell out to you by paying them more than they'd otherwise get.