Equilibrium bond-pricing models rely on inflation being bad news for future growth to generate upward-sloping nominal yield curves. We develop a model that can generate upward-sloping nominal and real yield curves by instead using ambiguity about inflation and growth. Ambiguity can help resolve...

Some key features in the historical dynamics of U.S. Treasury bond yields-a trend in long-term yields, business cycle movements in short-term yields, and a level shift in yield spreads-pose serious challenges to existing equilibrium asset pricing models. This paper presents a new equilibrium...