To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jfineco.2008.11.001 Byline: Evan W. Anderson (a), Eric Ghysels (b)(c)(d), Jennifer L. Juergens (e) Abstract: We study asset pricing in economies featuring both risk and uncertainty. In our empirical analysis, we measure risk via return volatility and uncertainty via the degree of disagreement of professional forecasters, attributing different weights to each forecaster. We empirically model the typical risk-return trade-off and augment these models with our measure of uncertainty. We find stronger empirical evidence for an uncertainty-return trade-off than for the traditional risk-return trade-off. Finally, we investigate the performance of a two-factor model with risk and uncertainty in the cross section. Author Affiliation: (a) Northern Illinois University, Department of Economics, Zulauf 515, DeKalb, IL 60115, USA (b) Department of Finance, Kenan-Flagler Business School, University of North Carolina -- Chapel Hill, Chapel Hill, NC 27599-3305, USA (c) Department of Economics, University of North Carolina -- Chapel Hill, Chapel Hill, NC 27599-3305, USA (d) Research Department, Federal Reserve Bank of New York, USA (e) University of Texas at Austin, Red McCombs School of Business, Department of Finance, Austin, TX 78712, USA Article History: Received 5 April 2007; Revised 6 November 2008; Accepted 14 November 2008 Article Note: (footnote) [star] We thank Lars Hansen, Peter Hansen, Chris Jones, Leonid Kogan, Jianjun Miao, Athanasios Orphanides, Simon Potter, Eric Renault, Robert Rich, Tom Sargent and Raman Uppal for very helpful comments. This paper was presented at Northern Illinois University, SAMSI Opening Workshop, 2006 EFA meetings, 2006 Winter Meetings of the Econometric Society, the SAMSI Conference on Model Uncertainty, 2006 NBER Summer Institute Asset Pricing Workshop, 2007 AFA meetings, UC Santa Cruz, University of Illinois at Urbana-Champaign, and University of Wisconsin-Madison. Early versions of the ideas in this paper were also presented at the Board of Governors, the FDIC, the Federal Reserve Bank of New York, Simon Fraser University and Stanford University. We thank seminar participants for helpful comments.