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Transformations of the State Variable and Learning Dynamics

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Author Info
Shurojit Chatterji () (Centro de Investigacion Economica (CIE), Instituto Tecnologico Autonomo de Mexico (ITAM))
Ignacio Lobato () (Centro de Investigacion Economica (CIE), Instituto Tecnologico Autonomo de Mexico (ITAM))

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Abstract

This article studies dynamics in a model where agents forecast a one dimensional variable via ordinary least squares regressions on the lagged values of the state variable. We study the stability properties of alternative transformations of the state variable that the agent can endogenously set forth. We study the consequences on the economy's stability of the typical transformations that an econometrician would attemp, such as differencing, detrending, or taking instantaneous concave transformations, such as logarithms. Surprinsingly, for the considered class of economies, we found that these transformations are destabilizing, whereas alternative transformations, which an econometrician would never consider, such as convex transformations, are stabilizing. Therefore, we ironically find that in our set-up. an active agent, who is concerned about learning the economy's dynamics and transforms the state variable, in an attempt to improve forecasting, is more likely to deviate from the steady state than a passive agent.

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File URL: http://ftp.itam.mx/pub/academico/inves/lobato/07-08.pdf
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File Function: First version, 2007
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Publisher Info
Paper provided by Centro de Investigacion Economica, ITAM in its series Working Papers with number 0708.

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Length: 35 pages
Date of creation: Dec 2007
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Handle: RePEc:cie:wpaper:0708

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Related research
Keywords: Temporary equilibrium; Ordinary least squares learning; Globally stable formulations;

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  1. Shurojit Chatterji, 1995. "Temporary Eq'Uilibrium Dynamics With Bayesian Learning," Working Papers. Serie AD 1995-09, Instituto Valenciano de Investigaciones Económicas, S.A. (Ivie). [Downloadable!]
    Other versions:
  2. Lobato, Ignacio N, 2003. "Testing for Nonlinear Autoregression," Journal of Business & Economic Statistics, American Statistical Association, vol. 21(1), pages 164-73, January.
  3. Evans, George W & Honkapohja, Seppo, 1998. "Economic Dynamics with Learning: New Stability Results," Review of Economic Studies, Blackwell Publishing, vol. 65(1), pages 23-44, January. [Downloadable!] (restricted)
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  4. Grandmont Jean-michel & Laroque G, 1990. "Economic dynamics with learning : some instability examples," CEPREMAP Working Papers (Couverture Orange) 9007, CEPREMAP.
  5. Bray, Margaret, 1982. "Learning, estimation, and the stability of rational expectations," Journal of Economic Theory, Elsevier, vol. 26(2), pages 318-339, April. [Downloadable!] (restricted)
  6. Chatterji, Shurojit & Ghosal, Sayantan, 2004. "Local coordination and market equilibria," Journal of Economic Theory, Elsevier, vol. 114(2), pages 255-279, February. [Downloadable!] (restricted)
  7. Van Zandt, Timothy & Lettau, Martin, 2003. "Robustness Of Adaptive Expectations As An Equilibrium Selection Device," Macroeconomic Dynamics, Cambridge University Press, vol. 7(01), pages 89-118, February. [Downloadable!]
  8. Spear, Stephen E. & Srivastava, Sanjay, 1986. "Markov rational expectations equilibria in an overlapping generations model," Journal of Economic Theory, Elsevier, vol. 38(1), pages 35-62, February. [Downloadable!] (restricted)
  9. Spear, Stephen E., 1985. "Rational expectations in the overlapping generations model," Journal of Economic Theory, Elsevier, vol. 35(2), pages 251-275, August. [Downloadable!] (restricted)
  10. Hellwig, Martin F., 1982. "Rational expectations and the Markov property of temporary equilibrium processes," Journal of Mathematical Economics, Elsevier, vol. 9(1-2), pages 135-144, January. [Downloadable!] (restricted)
  11. Lettau, Martin & Van Zandt, Timothy, 2001. "Robustness of Adaptive Expectations as an Equilibrium Selection Device," CEPR Discussion Papers 2882, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
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  12. Saari, Donald G. & Williams, Steven R., 1986. "On the local convergence of economic mechanisms," Journal of Economic Theory, Elsevier, vol. 40(1), pages 152-167, October. [Downloadable!] (restricted)
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