Bodie, Zvi and Robert C. Merton. “The Informational Role of Asset Prices: The Case of Implied Volatility.” Chap. 6 in The Global Financial System: A Functional Perspective, edited by Dwight B. Crane, Kenneth A. Froot, Scott P. Mason, André Perold, Robert C. Merton, Zvi Bodie, Erik R. Sirri and Peter Tufano, 197-224. Boston: Harvard Business School Press, 1995.