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Robust control and central banking behaviour

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  • Olalla, Myriam García
  • Gómez, Alejandro Ruiz

Abstract

This paper seeks to explain the recent behaviour of the two main central banks in the recent financial crisis, applying a robust control tool through a Neo-Keynesian monetary policy model. The direct forbearer of this paper is the Giordani and Söderlind (2004) study. It begins with the origin, purpose and theoretical grounds of robust control, indicating that it is one way to face model uncertainty, as an alternative to the Bayesian approach. In the middle section, we seek to obtain the course of the model's main variables: interest rates, inflation and output. The model constructor also wants the participating agents to have the same doubts that he has regarding its validity; therefore, robust control is considered as a "fine-tuning" of the rational expectations approach. The impulse-response functions are obtained, with the monetary authority acting as a Stackelberg-type leader, affected by a perturbation on the supply side. The two relevant equilibria are obtained and compared in robust control with dynamic economy (the reference equilibrium and the worst possible case equilibrium) with that obtained when operating with rational expectations. The alternative course for the reference model set forth in the paper by Dennis (2008) is also analysed. We mainly find that the different results depend on the behaviour of the law of motion of the state variables, specifically the shadow prices that influence the private sector's expectations. Lastly, the paper relates the recent monetary policy performance when facing the financial crisis that began in the summer of 2007.

Suggested Citation

  • Olalla, Myriam García & Gómez, Alejandro Ruiz, 2011. "Robust control and central banking behaviour," Economic Modelling, Elsevier, vol. 28(3), pages 1265-1278, May.
  • Handle: RePEc:eee:ecmode:v:28:y:2011:i:3:p:1265-1278
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    Cited by:

    1. Kwon, Hyosung & Miao, Jianjun, 2017. "Three types of robust Ramsey problems in a linear-quadratic framework," Journal of Economic Dynamics and Control, Elsevier, vol. 76(C), pages 211-231.
    2. Lars Peter Hansen & Thomas J Sargent, 2014. "Three Types of Ambiguity," World Scientific Book Chapters, in: UNCERTAINTY WITHIN ECONOMIC MODELS, chapter 11, pages 379-430, World Scientific Publishing Co. Pte. Ltd..
    3. Ben-Haim, Yakov & Demertzis, Maria & Van den End, Jan Willem, 2018. "Evaluating monetary policy rules under fundamental uncertainty: An info-gap approach," Economic Modelling, Elsevier, vol. 73(C), pages 55-70.
    4. Hansen, Lars Peter & Sargent, Thomas J., 2012. "Three types of ambiguity," Journal of Monetary Economics, Elsevier, vol. 59(5), pages 422-445.
    5. Yakov Ben-Haim & Jan Willem van den End, 2019. "Fundamental uncertainty about the natural rate of interest: Info-gap as guide for monetary policy," DNB Working Papers 650, Netherlands Central Bank, Research Department.

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