Macroeconomic Dynamics Near the ZLB: A Tale of Two Equilibria

66 Pages Posted: 18 Jul 2013

See all articles by S. Borağan Aruoba

S. Borağan Aruoba

University of Maryland - Department of Economics

Frank Schorfheide

University of Pennsylvania - Department of Economics; Centre for Economic Policy Research (CEPR); National Bureau of Economic Research (NBER); University of Pennsylvania - The Penn Institute for Economic Research (PIER)

Multiple version iconThere are 2 versions of this paper

Date Written: July 8, 2013

Abstract

This paper studies the dynamics of a New Keynesian dynamic stochastic general equilibrium (DSGE) model near the zero lower bound (ZLB) on nominal interest rates. In addition to the standard targeted-inflation equilibrium, we consider a deflation equilibrium as well as a Markov sunspot equilibrium that switches between a targeted-inflation and a deflation regime. We use the particle filter to estimate the state of the U.S. economy during and after the 2008-09 recession under the assumptions that the U.S. economy has been in either the targeted-inflation or the sunspot equilibrium. We consider a combination of fiscal policy (calibrated to the American Recovery and Reinvestment Act) and monetary policy (that tries to keep interest rates near zero) and compute government spending multipliers. Ex-ante multipliers (cumulative over one year) under the targeted-inflation regime are around 0.9. A monetary policy that keeps interest rates at zero can raise the multiplier to 1.7. The ex-post (conditioning on the realized shocks in 2009-11) multiplier is estimated to be 1.3. Conditional on the sunspot equilibrium, the multipliers are generally smaller and the scope for conventional expansionary monetary policy is severely limited.

Keywords: DSGE models, government spending

JEL Classification: C5, E4, E5

Suggested Citation

Aruoba, S. Boragan and Schorfheide, Frank, Macroeconomic Dynamics Near the ZLB: A Tale of Two Equilibria (July 8, 2013). FRB of Philadelphia Working Paper No. 13-29, Available at SSRN: https://ssrn.com/abstract=2294960 or http://dx.doi.org/10.2139/ssrn.2294960

S. Boragan Aruoba (Contact Author)

University of Maryland - Department of Economics ( email )

College Park, MD 20742
United States
301-405-3508 (Phone)
301-405-3542 (Fax)

Frank Schorfheide

University of Pennsylvania - Department of Economics ( email )

Ronald O. Perelman Center for Political Science
133 South 36th Street
Philadelphia, PA 19104-6297
United States

HOME PAGE: http://www.econ.upenn.edu/~schorf

Centre for Economic Policy Research (CEPR)

London
United Kingdom

National Bureau of Economic Research (NBER) ( email )

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

University of Pennsylvania - The Penn Institute for Economic Research (PIER) ( email )

Philadelphia, PA
United States

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