Where is all the Money?

According the U.S. Treasury, there is something like $900 billion in cash out there. That's a lot of money, but that would also mean that each U.S. citizen would have roughly $3,000. It turns out, that most people don't actually have that much cash. So where is it?

It isn't cash registers or banks. Turns out that about half of the cash is hoarded overseas, by folks like Argentine farmers and Hong Kong taxi drivers. Why? Our currency is more stable. But even with half the money out of the country, how do we account for the $400 billion or so left? What effect does this have on our economy?

Check out this fascinating NPR story for the answers.