Now replace "Greece" with "your bank." It suddenly matters a little more, doesn't it? What if your bank couldn't loan you money, give you a mortgage or allow you to ring up credit-card debt, all because the bank abruptly had much less with which to leverage your lifestyle since Greece decided to finally pull itself off fiscal life support? Granted, American banks only hold about $2 billion in Greek debt bonds, according to a 2011 Federal Reserve survey. But more significantly, they hold $34 billion worth of such bonds in Italy and Spain. If these two countries ever decide to flake out -- a real possibility, referred to as "contagion" -- good luck trying to get your bank to finance that car you can't afford.