Laurence Ball argues that the Federal Reserve (the Fed) could - and should - have bailed out Lehman Brothers so that it did not have to declare bankruptcy. He presents compelling evidence that it could have. I argue that the view that the Fed should not bail out Lehman is reasonable under the...

The volume of new issuances in secondary loan markets fluctuates over time and falls when collateral values fall. We develop a model with adverse selection and reputation that is consistent with such fluctuations. Adverse selection ensures that the volume of trade falls when collateral values...

Recent empirical work on financial crises documents that crises tend to occur when macroeconomic fundamentals are weak; but even after conditioning on an exhaustive list of fundamentals, a sizable random component to crises and associated capital flows remains. We develop a model of herd...

Macroeconomists have largely converged on method, model design, reduced-form shocks, and principles of policy advice. Our main disagreements today are about implementing the methodology. Some think New Keynesian models are ready to be used for quarter-to-quarter quantitative policy advice. We do...

In 1995, Robert E. Lucas was awarded the Nobel Memorial Prize for Economic Science. This review places Lucas's work in a historical context and evaluates the effect of this work on the economics profession. Lucas's central contribution is that he developed and applied economic theory to answer...

We propose a simple method to help researchers develop quantitative models of economic fluctuations. The method rests on the insight that many models are equivalent to a prototype growth model with time-varying wedges that resemble productivity, labor and investment taxes, and government...