They're back. Photos of bankers and Wall Street traders with heads in hands, rubbing their eyes. Though not a strong market indicator, business writer Chadwick Matlin tells us how the photoroll illuminates the larger difficulty of explaining why markets dive as they have this past week. It's significant, he writes in New York magazine, to remember that while markets influence the economy, a few bad days on Wall Street don't necessarily mean the larger economy is melting down. Matlin joins us from New York.