How big did this market become? Here's business correspondent Bob Moon and host Kai Ryssdal on American Public Media's Marketplace from back in the spring.
BOB MOON: OK, I'm about to unload some numbers on you here, so I'll speak slowly so you can follow this.
The value of the entire U.S. Treasuries market: $4.5 trillion.
The value of the entire mortgage market: $7 trillion.
The size of the U.S. stock market: $22 trillion.
OK, you ready?
The size of the credit default swap market last year: $45 trillion.
KAI RYSSDAL: That's a lot of money, Bob.