Target Controllability and Time Consistency: Complement to the Tinbergen Rule
The Tinbergen Rule states that achieving the desired targets requires an equal number of instruments. This paper shows that time inconsistency does not exist in the case of an equal number of instruments and targets. Target uncontrollability and time inconsistency, however, emerge as problems in the case of fewer instruments than targets. In this case, we obtain a necessary and sufficient condition for joint asymptotic controllability of target values, which complements the Tinbergen rule. The condition is identical under commitment and under discretion. If the condition does not hold, the steady-state values of target variables regress to their respective target values. The paper solves both problems by determining the central bank’s target values of inflation and output as well as the relative weight between stabilizing inflation and output. Intuitively, a proper target value trade-off solves target uncontrollability, whereas a proper relative weight achieves optimal target variability trade-off and solves time inconsistency. As a result, target values are controllable, establishing monetary policy credibility. Discretionary policy under the designed loss function, which replicates optimal policy under the social loss function, proves time-consistent. In addition, we identify two situations where the delegated weight equals the social weight, providing additional insight into time inconsistency.
|Date of creation:||Dec 2013|
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- N. Acocella & G. Bartolomeo & Andrew Hallett, 2006. "Controllability in Policy Games: Policy Neutrality and the Theory of Economic Policy Revisited," Computational Economics, Society for Computational Economics, vol. 28(2), pages 91-112, September.
- Hallett, Andrew Hughes & Acocella, Nicola & Di Bartolomeo, Giovanni, 2010.
"Policy games, policy neutrality and Tinbergen controllability under rational expectations,"
Journal of Macroeconomics,
Elsevier, vol. 32(1), pages 55-67, March.
- Di Bartolomeo Giovanni & Hughes Hallett Andrew & Acocella Nicola, 2008. "Policy games, policy neutrality and Tinbergen controllability under rational expectations," wp.comunite 0034, Department of Communication, University of Teramo.
- Julio Rotemberg & Michael Woodford, 1997. "An Optimization-Based Econometric Framework for the Evaluation of Monetary Policy," NBER Chapters, in: NBER Macroeconomics Annual 1997, Volume 12, pages 297-361 National Bureau of Economic Research, Inc.
- Nicola Acocella & Giovanni Di Bartolomeo, 2005.
"Tinbergen And Theil Meet Nash: Controllability In Policy Games,"
0504036, EconWPA, revised 06 Sep 2005.
- Acocella, N. & Di Bartolomeo, G., 2006. "Tinbergen and Theil meet Nash: Controllability in policy games," Economics Letters, Elsevier, vol. 90(2), pages 213-218, February.
- Giovanni Di Bartolomeo & Nicola Acocella, 2005. "Tinbergen and Theil Meet Nash: Controllability in Policy Games," Working Papers 2005.132, Fondazione Eni Enrico Mattei.
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