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Optimal and Simple Monetary Policy Rules with Zero Floor on the Nominal Interest Rate

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  • Anton Nakov

    (Banco de España)

Abstract

Recent treatments of the issue of a zero floor on nominal interest rates have been subject to some important methodological limitations. These include the assumption of perfect foresight or the introduction of the zero lower bound as an initial condition or a constraint on the variance of the interest rate, rather than an occasionally binding non-negativity constraint. This paper addresses these issues, offering a global solution to a standard dynamic stochastic sticky-price model with an explicit occasionally binding non-negativity constraint on the nominal interest rate. It turns out that the dynamics and sometimes the unconditional means of the nominal rate, inflation, and the output gap are strongly affected by uncertainty in the presence of the zero lower bound. Commitment to the optimal rule reduces unconditional welfare losses to around one-tenth of those achievable under discretionary policy, while constant price-level targeting delivers losses that are only 60 percent larger than those under the optimal rule. Even though the unconditional performance of simple instrument rules is almost unaffected by the presence of the zero lower bound, conditional on a strong deflationary shock, simple instrument rules perform substantially worse than the optimal policy.

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Bibliographic Info

Article provided by International Journal of Central Banking in its journal International Journal of Central Banking.

Volume (Year): 4 (2008)
Issue (Month): 2 (June)
Pages: 73-127

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Handle: RePEc:ijc:ijcjou:y:2008:q:2:a:3

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