The zero lower bound on nominal interest rates constrains the central bank's ability to stimulate the economy during downturns. We use the FRB/US model to quantify the effects of the zero bound on macroeconomic stabilization and to explore how policy can be designed to minimize these effects. During particularly severe contractions, open-market operations alone may be insufficient to restore equilibrium; some other stimulus is needed. Abstracting from such rare events, if policy follows the Taylor rule and targets a zero-inflation rate, there is a significant increase in the variability of output but not inflation. However, a simple modification to the Taylor rule yields a dramatic reduction in the detrimental effects of the zero bound.