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Monetary and fiscal policy interactions in a New Keynesian model with capital accumulation and non-Ricardian consumers

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Campbell Leith
Leopold von Thadden

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Abstract

This paper develops a small New Keynesian model with capital accumulation and government debt dynamics. The paper discusses the design of simple monetary and fiscal policy rules consistent with determinate equilibrium dynamics in the absence of Ricardian equivalence. Under this assumption, government debt turns into a relevant state variable which needs to be accounted for in the analysis of equilibrium dynamics. The key analytical finding is that without explicit reference to the level of government debt it is not possible to infer how strongly the monetary and fiscal instruments should be used to ensure determinate equilibrium dynamics. Specifically, we identify in our model discontinuities associated with threshold values of steady-state debt, leading to qualitative changes in the local determinacy requirements. These features extend the logic of Leeper (1991) to an environment in which fiscal policy is non-neutral and requires us to pay equal attention to to monetary and fiscal policy in designing policy rules consistent with determinate dynamics.

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Paper provided by Department of Economics, University of Glasgow in its series Working Papers with number 2006_6.

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Date of creation: Mar 2006
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Handle: RePEc:gla:glaewp:2006_6

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Web page: http://www.gla.ac.uk/departments/economics/

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Find related papers by JEL classification:
E52 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Monetary Policy
E63 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - Comparative or Joint Analysis of Fiscal and Monetary Policy; Stabilization

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  2. Richard Clarida & Jordi Gali & Mark Gertler, 1999. "The Science of Monetary Policy: A New Keynesian Perspective," Journal of Economic Literature, American Economic Association, vol. 37(4), pages 1661-1707, December. [Downloadable!] (restricted)
    Other versions:
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  14. Jess Benhabib & Stephanie Schmitt-Grohe & Martin Uribe, 2001. "Monetary Policy and Multiple Equilibria," American Economic Review, American Economic Association, vol. 91(1), pages 167-186, March. [Downloadable!] (restricted)
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  15. Taylor, John B., 1993. "Discretion versus policy rules in practice," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 39, pages 195-214, December. [Downloadable!] (restricted)
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  21. Leith, Campbell & Wren-Lewis, Simon, 2000. "Interactions between Monetary and Fiscal Policy Rules," Economic Journal, Royal Economic Society, vol. 110(462), pages C93-108, March. [Downloadable!] (restricted)
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  24. Woodford, Michael, 1994. "Monetary Policy and Price Level Determinacy in a Cash-in-Advance Economy," Economic Theory, Springer, vol. 4(3), pages 345-80.
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  28. Guido Ascari & Neil Rankin, 2004. "Perpetual youth and endogenous labour supply: a problem and a possible solution," Working Paper Series 346, European Central Bank. [Downloadable!]
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