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Learning and Expectational Stability under Robust Monetary Policy

In the last few years, several articles have been devoted to the study of model uncertainty in the New Keynesian model using robust control methods. Most studies have focused on how to design a robust monetary policy to take model uncertainty more seriously. Little attention has, however, been given to expectation formation under such a robust monetary policy. The purpose of this study is to explore the expectational stability under robust monetary policy when private expectations are formed by the adaptive learning technology. We find that the economy is determinate and stable under learning if (i) private agents' expectations are observable to the central bank and appropriately incorporated into its optimal policy rules, and (ii) the central bank's preference for robustness is sufficiently weak. It follows that it is important for the central bank to consider expectational stability when it implements a robust monetary policy.