Textbooks don't teach people how to avoid paying any income tax. But that's what an army of tax lawyers and corporate tax accountants do.

In China the largest denomination bill they have is 100 yen, and that's maybe $7. So here you have a whole economy working with only a $7 note as the largest denomination. The euro wants to get rid of the 500-euro bill just as the United States years ago got rid of the $1,000 bill because only the criminals used $1,000 bills.

The problems of 2008 were never cured. The Federal Reserve's solution to the crisis was to lend the economy enough money to borrow its way out of debt. It thought that if it could subsidize banks lending homeowners enough money to buy houses from people who are defaulting, then the bank balance sheets would end up okay.

We're still in the collapse that began after 2008. There's not a new collapse, there hasn't been a recovery.

The world's politics are in turmoil, not to mention the Mideast, where the US has mounted attacks from Libya to Iraq to Syria, and ISIS is attacking governments in today's pipeline rivalry.

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.

To save the banks, you would have to turn the entire Eurozone into Greece.