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Simple Analytics of the Government Expenditure Multiplier

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  • Woodford, Michael

Abstract

This paper explains the key factors that determine the effectiveness of government purchases as a means of increasing output and employment in New Keynesian models, through a series of simple examples that can be solved analytically. Delays in the adjustment of prices or wages can allow for larger multipliers than exist in the case of fully flexible prices and wages; in a fairly broad class of simple models, the multiplier is 1 in the case that the monetary authority maintains a constant path for real interest rates. The multiplier can be considerably smaller, however, if the monetary authority raises real interest rates in response to increases in inflation or real activity resulting from the fiscal stimulus. A large multiplier is especially plausible when monetary policy is constrained by the zero lower bound on nominal interest rates; in such a case, expected utility is maximized by expanding government purchases to at least partially fill the output gap that would otherwise exist owing to the central bank's inability to cut interest rates. However, it is important in such a case that neither the increased government purchases nor the increased taxes required to finance them be expected to persist beyond the period over which monetary policy is constrained by the zero lower bound.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 7704.

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Date of creation: Feb 2010
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Handle: RePEc:cpr:ceprdp:7704

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Keywords: fiscal stimulus; zero lower bound;

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  1. Quelle est la taille du multiplicateur budgétaire ?
    by ? in D'un champ l'autre on 2014-01-17 21:59:00
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