Controllability under rational expectations

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Controllability under rational expectations

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Hughes Hallett Andrew
Di Bartolomeo Giovanni
Acocella Nicola

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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.

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Paper provided by Department of Communication, University of Teramo in its series wp.comunite with number 0042.

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Date of creation: May 2008
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Handle: RePEc:ter:wpaper:0042

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Find related papers by JEL classification:
C61 - Mathematical and Quantitative Methods - - Mathematical Methods and Programming - - - Optimization Techniques; Programming Models; Dynamic Analysis
C62 - Mathematical and Quantitative Methods - - Mathematical Methods and Programming - - - 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

This paper has been announced in the following NEP Reports:

NEP-ALL-2008-05-24 (All new papers)
NEP-CBA-2008-05-24 (Central Banking)
NEP-MAC-2008-05-24 (Macroeconomics)

References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:

Blanchard, Olivier Jean & Kiyotaki, Nobuhiro, 1987. "Monopolistic Competition and the Effects of Aggregate Demand," American Economic Review, American Economic Association, vol. 77(4), pages 647-66, September. [Downloadable!] (restricted)
Jeffrey D. Amado & Stephen Morris & Hyun Song Shin, 2003. "Communication and Monetary Policy," Cowles Foundation Discussion Papers 1405, Cowles Foundation, Yale University. [Downloadable!]
Other versions:
- Stephen Morris & Jeffery D. Amato & Hyun Song Shin, 2004. "Communication and Monetary Policy," Yale School of Management Working Papers ysm345, Yale School of Management. [Downloadable!]
- Jeffery Amato & Stephen Morris & Hyun Song Shin, 2003. "Communication and Monetary Policy," Levine's Bibliography 506439000000000330, UCLA Department of Economics. [Downloadable!]
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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. [Downloadable!]
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Other versions:
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Other versions:
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Other versions:
- Glenn D. Rudebusch & John C. Williams, 2006. "Revealing the secrets of the temple: the value of publishing central bank interest rate projections," Working Paper Series 2006-31, Federal Reserve Bank of San Francisco. [Downloadable!]
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. [Downloadable!] (restricted)
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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. [Downloadable!] (restricted)

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