Benjamin K. Johannsen

Board of Governors of the Federal Reserve System
20th and C Streets, N.W.
Washington, DC 20551
Tel: 202-530-6221

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Institutional Affiliation: Federal Reserve Board

NBER Working Papers and Publications

May 2018Does the New Keynesian Model Have a Uniqueness Problem?
with Lawrence Christiano, Martin S. Eichenbaum: w24612
This paper addresses whether non-uniqueness of equilibrium is a substantive problem for the analysis of fiscal policy in New-Keynesian (NK) models at the zero lower bound (ZLB). There would be a substantive problem if there were no compelling way to select among different equilibria that give different answers to critical policy questions. We argue that learnability provides such a criterion. We study a fully non-linear NK model with Calvo pricing frictions. Our main finding is that the model we analyze has a unique E-stable rational expectations equilibrium at the ZLB. That equilibrium is also stable-under-learning and inherits all of the key properties of linearized NK models for fiscal policy.
February 2017Monetary Policy and the Predictability of Nominal Exchange Rates
with Martin Eichenbaum, Sergio Rebelo: w23158
This paper studies how the monetary policy regime affects the relative importance of nominal exchange rates and inflation rates in shaping the response of real exchange rates to shocks. We document two facts about inflation-targeting countries. First, the current real exchange rate predicts future changes in the nominal exchange rate. Second, the real exchange rate is a poor predictor of future inflation rates. We estimate a medium-size DSGE open-economy model that accounts quantitatively for these facts as well as other empirical properties of real and nominal exchange rates. The key estimated shocks that accounts for the dynamics of exchange rates and their covariance with inflation are disturbances to the foreign demand for dollar-denominated bonds.

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