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Controllability under rational expectations

Author

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  • Hughes Hallett Andrew
  • Di Bartolomeo Giovanni
  • Acocella Nicola

Abstract

We show that rational expectations do not affect the controllability of an economic system, either in its static or in its dynamic version, even though their introduction in many other circumstances may make it impossible for the policymaker to affect certain variables due to policy invariance, policy neutrality or time inconsistency problems. The controllability conditions stated by Tinbergen and subsequent authors continue to hold under rational expectations; and when they are satisfied rational expectations may even enhance the power to control an economy over time. This is important because it shows that an underlying equilibrium can exist even if our conventional optimisation techniques lead to policy invariance, neutrality or time inconsistency. We provide examples of our results in the context of recent monetary policy debates.

Suggested Citation

  • Hughes Hallett Andrew & Di Bartolomeo Giovanni & Acocella Nicola, 2008. "Controllability under rational expectations," wp.comunite 0042, Department of Communication, University of Teramo.
  • Handle: RePEc:ter:wpaper:0042
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    File URL: http://wp.comunite.it/data/wp_no_42_2008.pdf
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    References listed on IDEAS

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    1. Jeffery D. Amato & Stephen Morris & Hyun Song Shin, 2002. "Communication and Monetary Policy," Oxford Review of Economic Policy, Oxford University Press, vol. 18(4), pages 495-503.
    2. Faust, Jon & Svensson, Lars E O, 2002. "The Equilibrium Degree of Transparency and Control in Monetary Policy," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 34(2), pages 520-539, May.
    3. Glenn D. Rudebusch & John C. Williams, 2008. "Revealing the Secrets of the Temple: The Value of Publishing Central Bank Interest Rate Projections," NBER Chapters,in: Asset Prices and Monetary Policy, pages 247-289 National Bureau of Economic Research, Inc.
    4. Blanchard, Olivier Jean & Kiyotaki, Nobuhiro, 1987. "Monopolistic Competition and the Effects of Aggregate Demand," American Economic Review, American Economic Association, vol. 77(4), pages 647-666, September.
    5. Stefano Eusepi & Bruce Preston, 2010. "Central Bank Communication and Expectations Stabilization," American Economic Journal: Macroeconomics, American Economic Association, vol. 2(3), pages 235-271, July.
    6. Alesina, Alberto & Tabellini, Guido, 1987. "Rules and Discretion with Noncoordinated Monetary and Fiscal Policies," Economic Inquiry, Western Economic Association International, vol. 25(4), pages 619-630, October.
    7. Fisher, P. G. & Hallett, A. J. Hughes, 1988. "Efficient solution techniques for linear and non-linear rational expectations models," Journal of Economic Dynamics and Control, Elsevier, vol. 12(4), pages 635-657, November.
    8. Di Bartolomeo Giovanni & Acocella Nicola & Hughes Hallett Andrew, 2008. "The existence of Nash equilibria in n-player LQ-games, with applications to international monetary and trade agreements," wp.comunite 0040, Department of Communication, University of Teramo.
    9. Hallett, A. Hughes & Ma, Y. & Yin, Y. P., 1996. "Hybrid algorithms with automatic switching for solving nonlinear equation systems," Journal of Economic Dynamics and Control, Elsevier, vol. 20(6-7), pages 1051-1071.
    10. Hughes Hallett, Andrew J, 1989. "Econometrics and the Theory of Economic Policy: The Tinbergen-Theil Contributions 40 Years On," Oxford Economic Papers, Oxford University Press, vol. 41(1), pages 189-214, January.
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    Cited by:

    1. Acocella, Nicola & Di Bartolomeo, Giovanni & Hughes Hallett, Andrew, 2008. "When Can Central Banks Anchor Expectations? Policy communication and controllability," CEPR Discussion Papers 7078, C.E.P.R. Discussion Papers.

    More about this item

    JEL classification:

    • C61 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Optimization Techniques; Programming Models; Dynamic Analysis
    • C62 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Existence and Stability Conditions of Equilibrium
    • E52 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Monetary Policy
    • E61 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - Policy Objectives; Policy Designs and Consistency; Policy Coordination
    • E62 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - Fiscal Policy

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