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The Zero Lower Bound: Frequency, Duration, and Numerical Convergence

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  • Alexander W. Richter
  • Nathaniel A. Throckmorton

Abstract

When monetary policy faces a zero lower bound (ZLB) constraint on the nominal interest rate, a minimum state variable (MSV) solution may not exist even if the Taylor principle holds when the ZLB does not bind. This paper shows there is a clear tradeoff between the expected frequency and average duration of ZLB events along the boundary of the convergence region---the region of the parameter space where our policy function iteration algorithm converges to an MSV solution. We show this tradeoff with two alternative stochastic processes: one where monetary policy follows a 2-state Markov chain, which exogenously governs whether the ZLB binds, and the other where ZLB events are endogenous due to discount factor or technology shocks. We also show that small changes in the parameters of the stochastic processes cause meaningful differences in the decision rules and where the ZLB binds in the state space.

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Paper provided by Department of Economics, Auburn University in its series Auburn Economics Working Paper Series with number auwp2014-09.

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Date of creation: May 2014
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Handle: RePEc:abn:wpaper:auwp2014-09

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Keywords: Monetary policy; zero lower bound; convergence; minimum state variable solution; policy function iteration;

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