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Analyzing Economic Policy Using High Order Perturbations

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Author Info
Michael Ben-Gad () (Department of Economics, City University, London)
Abstract

In this paper I demonstrate the use of high order general perturbations to analyze policy changes in dynamic economic models. The inclusion of high moments in approximating the behavior of dynamic models is particularly necessary for welfare analysis. I apply the method of general perturbations to the analysis of permanent changes to a flat rate tax on the return to capital in the context of the standard Ramsey optimal growth model. Reliance on simple linearizations or quadratic approximations are adequate for generating impulse responses for the variables of interest or the welfare analysis of small policy changes. However when considering the welfare implications of sizable policy changes, the failure to include higher moments can lead not only to quantitatively serious inaccuracies, but even to spurious welfare reversals.

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Paper provided by Department of Economics, City University, London in its series City University Economics Discussion Papers with number 08/07.

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Length: 41 pages
Date of creation: May 2008
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Handle: RePEc:cty:dpaper:0807

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  1. Ben-Gad, Michael, 2004. "The economic effects of immigration--a dynamic analysis," Journal of Economic Dynamics and Control, Elsevier, vol. 28(9), pages 1825-1845, July. [Downloadable!] (restricted)
  2. Kim, Jinill & Kim, Sunghyun Henry, 2003. "Spurious welfare reversals in international business cycle models," Journal of International Economics, Elsevier, vol. 60(2), pages 471-500, August. [Downloadable!] (restricted)
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  3. Judd, Kenneth L., 1982. "An alternative to steady-state comparisons in perfect foresight models," Economics Letters, Elsevier, vol. 10(1-2), pages 55-59. [Downloadable!] (restricted)
  4. Michael Ben-Gad, 2008. "Capital-Skill Complementarity and the Immigration Surplus," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 11(2), pages 335-365, April. [Downloadable!] (restricted)
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  5. Judd, Kenneth L, 1987. "The Welfare Cost of Factor Taxation in a Perfect-Foresight Model," Journal of Political Economy, University of Chicago Press, vol. 95(4), pages 675-709, August. [Downloadable!] (restricted)
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  6. Judd, Kenneth L., 1985. "Redistributive taxation in a simple perfect foresight model," Journal of Public Economics, Elsevier, vol. 28(1), pages 59-83, October. [Downloadable!] (restricted)
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