Nonlinear Business Cycle and Optimal Policy: A VSTAR Perspective

Vito Polito

No 8060, CESifo Working Paper Series from CESifo

Abstract: This paper studies optimal macroeconomic policy when nonlinearity in the business cycle is described by a vector smooth transition autoregression (VSTAR). A structural identification of the VSTAR that yields a low-dimension and certainty-equivalent nonlinear quadratic regulator (NLQR) problem is derived. Optimal rules are calculated by adapting from the engineering theory the approach of State Dependent Riccati Equation, which allows standard dynamic programming techniques to solve NLQR problems. The methodology is employed to study optimal conventional and quantitative easing (QE) monetary policy using a VSTAR model esti-mated on data for the United States during 1979-2018. The model allows for regime changes during periods of economic slack and when interest rates are near the zero lower bound. The results highlight the quantitative significance of nonlinearity in the analysis of optimal monetary policy and how the size, timing and composition of QE can influence macroeconomic dynamics.

Keywords: smooth transition models; nonlinear quadratic regulator; zero lower bound; quantitative easing; optimal monetary policy (search for similar items in EconPapers)
JEL-codes: C30 C60 E50 (search for similar items in EconPapers)
Date: 2020
New Economics Papers: this item is included in nep-cba and nep-mac
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