Impact of This Week's Plunge in Global Financial on Main Street

The British stock market has fallen for eight straight days, the Hong Kong Market's in its worst slump since 2011 and, today Wall Street is ending its worst week since 2012. Is it time to panic? David Wessel is former Economics Editor at the Wall Street Journal. He's now director of the Hutchins Center on Fiscal and Monetary Policy at the Brookings Institution.