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Deterministic Chaos in the Foreign Exchange Markets

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  • De Grauwe, Paul

Abstract

Linear models in which exchange rates are driven by stochastic `news' are subject to a number of failings. In this paper we present a non-linear, deterministic model, incorporating concepts from chaos theory, which is capable of producing unpredictable exchange rate movements without `news'. Two non-linearities arise from a J-curve effect in the trade balance and the modelling of both `chartist' and `fundamental' influences in expectations formation. The model displays extreme sensitivity to only small changes in its initial conditions and its parameter values - one of the requirements for a model to generate chaotic behaviour. Only a few periods after such changes, the time path of the exchange rate appears to have been generated from a totally different model. This implies that forecasts based on exchange rate models are effectively impossible, because the tiniest errors generate totally different paths for the exchange rate. The results warn against excessive reliance on `news' to explain exchange rate movements.

Suggested Citation

  • De Grauwe, Paul, 1990. "Deterministic Chaos in the Foreign Exchange Markets," CEPR Discussion Papers 370, C.E.P.R. Discussion Papers.
  • Handle: RePEc:cpr:ceprdp:370
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    Citations

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    Cited by:

    1. Lisi, Francesco & Schiavo, Rosa A., 1999. "A comparison between neural networks and chaotic models for exchange rate prediction," Computational Statistics & Data Analysis, Elsevier, vol. 30(1), pages 87-102, March.
    2. Sergio Da Silva, 2004. "The Dornbusch Model with Chaos and Foreign Exchange Intervention," International Finance 0405017, EconWPA.
    3. Fernando Fernández-Rodríguez & Simón Sosvilla-Rivero & Julián Andrada-Félix, "undated". "Nearest-Neighbour Predictions in Foreign Exchange Markets," Working Papers 2002-05, FEDEA.
    4. Fernandez-Rodriguez, Fernando & Sosvilla-Rivero, Simon & Andrada-Felix, Julian, 1999. "Exchange-rate forecasts with simultaneous nearest-neighbour methods: evidence from the EMS," International Journal of Forecasting, Elsevier, vol. 15(4), pages 383-392, October.
    5. Pierdzioch, Christian & Stadtmann, Georg, 1999. "Komplexe Aktien- und Wechselkursdynamik in einem makroökonomischen Modell mit heterogener Erwartungsbildung," Kiel Working Papers 911, Kiel Institute for the World Economy (IfW).
    6. Wan, Jer-Yuh & Kao, Chung-Wei, 2009. "Evidence on the contrarian trading in foreign exchange markets," Economic Modelling, Elsevier, vol. 26(6), pages 1420-1431, November.
    7. Federici, Daniela & Gandolfo, Giancarlo, 2012. "The Euro/Dollar exchange rate: Chaotic or non-chaotic? A continuous time model with heterogeneous beliefs," Journal of Economic Dynamics and Control, Elsevier, vol. 36(4), pages 670-681.

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