<I>Market Volatility </I>proposes an innovative theory, backed by substantial statistical evidence, on the causes of price fluctuations in speculative markets. It challenges the standard efficient-markets model for explaining asset prices by emphasizing the significant role that popular opinion or psychology can play in price volatility.<br /><br />Offering detailed analyses of the stock, the bond, and the real estate markets, Shiller discusses the relations of these speculative prices and extends the analysis of speculative markets to macroeconomic activity in general.<br /><br />Robert J. Shiller is Stanley B. Resor Professor of Economics at the Cowles Foundation, Yale University.