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Stochastic Process Switching and Intervention in Exchange Rate Target Zones: Empirical Evidence from the EMS

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  • Weber, Axel A
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    Abstract

    Exchange rate target zone models postulate that `in the absence of intervention' exchange rates are driven by their fundamentals, which in this case are assumed to follow an unregulated Brownian motion process-the continuous time equivalent of a random walk (with drift). Such random walk behaviour of freely floating exchange rates is a well-documented stylized fact. The possibility of policy intervention in foreign exchange markets, however, may lead to stochastic process switching: in a perfectly credible target zone the commitment of policy-makers to intervene at the boundaries of a band for the fundamentals gives rise to speculative bubbles, which stabilize the exchange rate within a narrower band. Inframarginal intervention may add to these stabilizing effects. On the other hand, in target zones which are imperfectly credible, policy intervention may also take the form of a realignment, a permanent jump in the central parity. The present paper employs a Bayesian approach to estimate the relative probabilities of these forms of stochastic process switching by using daily data on the Deutschmark exchange rate for the EMS currencies. The analysis reveals that for these EMS target zones intervention and realignment probabilities have recently declined drastically, and that the ERM is now close to being a fully credible peg.

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    Bibliographic Info

    Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 554.

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    Date of creation: Jul 1991
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    Handle: RePEc:cpr:ceprdp:554

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    Related research

    Keywords: EMS; Intervention; Realignment; Target Zones;

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    Cited by:
    1. Antoine Magnier, 1992. "Théorie des zones cibles et fonctionnement du SME," Économie et Prévision, Programme National Persée, vol. 104(3), pages 87-113.
    2. Francisco Ledesma-Rodriguez & Manuel Navarro-Ibanez & Jorge Perez-Rodriguez & Simon Sosvilla-Rivero, 2005. "Assessing the credibility of a target zone: evidence from the EMS," Applied Economics, Taylor & Francis Journals, vol. 37(19), pages 2265-2287.
    3. Hans Lindberg & Lars E.O. Svensson & Paul Soderlind, 1991. "Devaluation Expectations: The Swedish Krona 1982-1991," NBER Working Papers 3918, National Bureau of Economic Research, Inc.

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