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.

Every government, from the Obama administration right through to Angela Merkel, the Eurozone and the IMF, promise to save the banks, not the economy.

Oil is a special case. Saudi Arabia is trying to drive U.S. fracking rivals out of business, while also hurting Russia. This lowers gas prices for U.S. and Eurozone consumers, but not by enough to spur economic recovery.

Income is sucked upward to the creditors, who then foreclose on the assets of debtors. This shrinks tax revenue, forcing public budgets into deficit. And when governments are indebted, they becomemore subject to pressure to privatization of public enterprise.

From 2008 to 2016 all the growth in the American economy, all the growth in national income, was earned just by the wealthiest 5% of the population. So they got all the growth. 95% of the population didn't grow. If you can get a flat tax or other lower tax, as Trump is suggesting, then this richest 5% will be able to keep even more money. That means that the 95% will be even poorer than they were before, relative to the very top.

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.

Mathematically, debts grow exponentially at compound interest. Banks recycle the interest into new loans, so debts grow exponentially, faster than the economy can afford to pay.