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Expectational Stability in Multivariate Models

  • Seonghoon Cho

    ()

    (School of Economics, Yonsei University, Seoul, Korea)

  • Antonio Moreno

    ()

    (Department of Economics, University of Navarra, Pamplona, Spain)

This paper shows that the concept of Expectational stability (E-stability) in a multivariate framework is inherently model-dependent. Whereas a Rational Expectations equilibrium (REE) is subject to model-specific parameter restrictions from the economic model at hand, a perceived law of motion (PLM) is postulated without such restrictions because economic agents are not likely to know the restrictions a priori. Therefore, an unrestricted PLM is in general overparameterized relative to an REE of interest in multivariate models even when the functional form is the same as the REE. Since E-stability necessarily involves model-specific extents of overparameterization, it is model-dependent in general. An immediate implication is that E-stability in a multivariate framework is not directly comparable across models and, in particular, across different representations of a given model. This implies that one may draw different conclusions on E-stability of an REE to one model under alternative representations of the model and the REE. We discuss a potential direction to develop a model-independent concept of E-stability.

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File URL: http://www.unav.es/facultad/econom/files/workingpapersmodule/@random482ac104b1c71/1223308483_06_08_EStability20081006.pdf
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Paper provided by School of Economics and Business Administration, University of Navarra in its series Faculty Working Papers with number 06/08.

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Length: 37 pages
Date of creation: 06 Oct 2006
Date of revision:
Handle: RePEc:una:unccee:wp0608
Contact details of provider: Web page: http://www.unav.es/facultad/econom

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  1. Adam, Klaus, 2003. "Learning and Equilibrium Selection in a Monetary Overlapping Generations Model with Sticky Prices," CFS Working Paper Series 2003/03, Center for Financial Studies (CFS).
  2. Evans, George W. & Honkapohja, Seppo, 2003. "Expectational stability of stationary sunspot equilibria in a forward-looking linear model," Journal of Economic Dynamics and Control, Elsevier, vol. 28(1), pages 171-181, October.
  3. Bennett T. McCallum, 2006. "E-Stability vis-a-vis Determinacy Results for a Broad Class of Linear Rational Expectations Models," NBER Working Papers 12441, National Bureau of Economic Research, Inc.
  4. Kaushik Mitra & James Bullard, . "Learning About Monetary Policy Rules," Discussion Papers 00/41, Department of Economics, University of York.
  5. George W. Evans & Seppo Honkapohja, 2003. "Expectations and the Stability Problem for Optimal Monetary Policies," Review of Economic Studies, Wiley Blackwell, vol. 70(4), pages 807-824, October.
  6. Adam, Klaus & Evans, George W. & Honkapohja, Seppo, 2006. "Are hyperinflation paths learnable?," Journal of Economic Dynamics and Control, Elsevier, vol. 30(12), pages 2725-2748, December.
  7. Gauthier, S., 1999. "Determinacy and Stability Under Learning of Rational Expectations Equilibria," G.R.E.Q.A.M. 99a46, Universite Aix-Marseille III.
  8. George W. Evans & Seppo Honkapohja & Ramon Marimon, 2002. "Stable Sunspot Equilibira in a Cash-in-Advance Economy," University of Oregon Economics Department Working Papers 2001-5, University of Oregon Economics Department, revised 15 Nov 2005.
  9. Giannitsarou, Chryssi, 2005. "E-Stability Does Not Imply Learnability," Macroeconomic Dynamics, Cambridge University Press, vol. 9(02), pages 276-287, April.
  10. Heinemann, Maik, 2000. "Convergence Of Adaptive Learning And Expectational Stability: The Case Of Multiple Rational-Expectations Equilibria," Macroeconomic Dynamics, Cambridge University Press, vol. 4(03), pages 263-288, September.
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