Robert Shiller and Karl Case, co-creators of the S&P/Case-Shiller index of property values in 20 U.S. cities, talks about the housing market and home prices. The S&P/Case-Shiller index fell 4 percent in December, more than forecast, to the lowest level since the housing crisis began in mid-2006. Shiller and Case speak with Tom Keene on Bloomberg Radio’s “Surveillance.”