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Domestic–foreign Interest Rate Differentials: Near Unit Roots and Symmetric Threshold Models


  • Jack Strauss

    () (Department of Economics, Saint Louis University)

  • Mark E. Wohar

    () (Department of Economics, University of Nebraska at Omaha)


This paper investigates the near unit root behavior of interest rate differentials across countries using a symmetric Band–TAR model that allows for a heteroscedastic error process. We find that the time series properties of monthly short-term interest differentials over the period 1974–2005 between the United States and Canada, France, Germany, Japan, and the United Kingdom can be characterized by a symmetric Band–TAR process, which can explain its (near) unit root behavior reported in the extant literature. Results significantly reject a linear model in favor of the alternative hypothesis of a two-regime symmetric threshold model that exhibits significantly greater persistence within the threshold bands than when outside the threshold bands.

Suggested Citation

  • Jack Strauss & Mark E. Wohar, 2007. "Domestic–foreign Interest Rate Differentials: Near Unit Roots and Symmetric Threshold Models," Southern Economic Journal, Southern Economic Association, vol. 73(3), pages 814-829, January.
  • Handle: RePEc:sej:ancoec:v:73:3:y:2007:p:814-829

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    References listed on IDEAS

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    Cited by:

    1. Ahmad Zubaidi Baharumshah & Venus Khim-Sen Liew & Chan Tze Haw, 2009. "The Real Interest Rate Differential: International Evidence Based On Non-Linear Unit Root Tests," Bulletin of Economic Research, Wiley Blackwell, vol. 61(1), pages 83-94, January.

    More about this item

    JEL classification:

    • F31 - International Economics - - International Finance - - - Foreign Exchange
    • F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics


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