Looked at one way, the current flailing economy is a victim of invention—Wall Street invention. Investors and banks and brokers created all sorts of stuff the world would've been better off without. In the aftermath, Democrats have blamed Republicans for the mess, and, naturally, Republicans have blamed Democrats. Ira talks to Charles Duhigg, whose been covering the subprime mortgage crisis for The New York Times, to find out who we should really be mad at. (10 minutes)