Now, suppose that a homeowner puts down only 3% of their own money or 3.5% for the FHA. That means if prices go down by only 3%, the house will be in negative equity and it would pay the homeowner just to walk away and say, "The house now is worth less than the mortgage I owe. I think I'm just going to move out and buy a cheaper house." So it's very risky when you have only a 3% or 3.5% equity for the loan. The bank really isn't left with much cushion as collateral.

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.

Economists often define their discipline as "the allocation of scarce resources among competing ends." But when resources or money really become scarce, economists call it a crisis and say that it's a question for politicians, not their own department.

That's why Apple, Microsoft and the big information technology companies have kept so much money registered abroad (although in US dollar accounts with a nominal foreign address's owner). They pretend to make their global income in Ireland. They have an office, which could be simply a postal drop box in Ireland, and claim to make all their money there, not in America.

Today's national income statistics make it appear that Goldman Sachs is productive. As if Donald Trump plays a productive role. The aim is to make it appear that people who take money from the rest of the economy without working are productive, despite not really providing any service that actually contributes to GDP and economic growth.

People tend to think that paying a debt is like going out and buying a car, buying more food or buying more clothes. But it really isn't. When you pay a debt to the bank, the banks use this money to lend out to somebody else or to yourself. The interest charges to carry this debt go up and up as debt grows.

People think of a business cycle, which is a boom followed by a recession and then automatic stabilizers revive the economy. But this time we can't revive. The reason is that every recovery since 1945 has begun with a higher, and higher level of debt. The debt is so high now, that since 2008 we've been in what I call, debt deflation.