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Federal Reserve Bank of Boston
Working Papers
Estimation of forward-looking relationships in closed form: an application to the New Keynesian Phillips curve
Michelle L. Barnes
Fabià Gumbau-Brisa
Denny Lie
Giovanni P. Olivei
Abstract

We illustrate the importance of placing model-consistent restrictions on expectations in the estimation of forward-looking Euler equations. In two-stage limited-information settings where first-stage estimates are used to proxy for expectations, parameter estimates can differ substantially, depending on whether these restrictions are imposed or not. This is shown in an application to the New Keynesian Phillips Curve (NKPC), first in a Monte Carlo exercise, and then on actual data. The closed-form (CF) estimates require by construction that expectations of inflation be model-consistent at all points in time, while the difference-equation (DE) estimates impose no model discipline on expectations. Between those two polar extremes there is a wide range of alternative DE specifications based on the same dynamic relationship that explicitly imposes model restrictions on expectations for a finite number of periods. In our application, these last estimates quickly converge to the CF estimates and illustrate that the DE estimates in Cogley and Sbordone (2008) are not robust to imposing modest model requirements on expectations. In particular, our estimates show that the NKPC is not purely forward-looking, and thus that time-varying trend inflation is insufficient to explain inflation persistence.


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Michelle L. Barnes & Fabià Gumbau-Brisa & Denny Lie & Giovanni P. Olivei, Estimation of forward-looking relationships in closed form: an application to the New Keynesian Phillips curve, Federal Reserve Bank of Boston, Working Papers 11-3, 2011.
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Keywords: Phillips curve ; Economic forecasting
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