This paper analyzes optimal portfolio choice and consumption with stochastic volatility in incomplete markets. Using … for stocks under stochastic volatility varies strongly with the investor's coefficient of relative risk aversion, but only … preference parameters. This paper also shows that stochastic variation in volatility produces an optimal intertemporal hedging …

for time-varying volatility. We then feed these processes into an otherwise standard New Keynesian business cycle model … calibrated to the U.S. economy. We find that fiscal volatility shocks have an adverse effect on economic activity that is …

.S. household survey, we measure ambiguity aversion using custom- designed questions based on Ellsberg urns. As theory predicts …

We develop a tractable and flexible stochastic volatility multi-factor model of the term structure of interest rates …

We propose a discrete-time stochastic volatility model in which regime switching serves three purposes. First, changes …

At the zero lower bound, the central bank's inability to offset shocks endogenously generates volatility. In this …-contingent optimal monetary and fiscal policies can attenuate this endogenous volatility by stabilizing the distribution of future … outcomes. Fluctuations in uncertainty and the zero lower bound help our model match the unconditional and stochastic volatility …