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Nonlinear Econometric Approaches in Testing PPP of SADC Economies towards Monetary Union

Author

Listed:
  • Mulatu F. Zerihun

    (Department of Economics, University of Pretoria)

  • Marthinus C. Breitenbach

    (Department of Economics, University of Pretoria)

  • Francis Kemegue

    (Department of Economics, University of Pretoria, and Framingham University, USA)

Abstract

The theory of purchasing power parity implies that real exchange rate series should be stationary. However, conventional unit root tests on the Southern African Development community (SADC) real exchange rates confirm the existence of a unit root. Such deficiencies in the investigation of the dynamics of real exchange rates in the region calls for nonlinear methods like the method used in this study to be pursued, which may better explain the dynamics of real exchange rates in SADC. In this paper two nonlinearity tests are employed: the nonparametric test developed by Brock, Dechert, and Scheinkman - known as the BDS test and the Fourier stationarity test. The BDS test detects the independent and identically distribute (iid) assumption of the time series used in the analysis while the Fourier approximation mimics a wide variety of breaks and other types of nonlinearities. Both tests confirm the non-linear nature of real exchange series in SADC. The result from the Fourier stationarity test further provides strong evidence of an OCA among the 11 SADC countries included in the study.

Suggested Citation

  • Mulatu F. Zerihun & Marthinus C. Breitenbach & Francis Kemegue, 2014. "Nonlinear Econometric Approaches in Testing PPP of SADC Economies towards Monetary Union," Working Papers 201406, University of Pretoria, Department of Economics.
    • Handle: RePEc:pre:wpaper:201406
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    Cited by:

    1. Wörgötter, Andreas & Brixiova, Zuzana, 2020. "Monetary Unions of Small Currencies and a Dominating Member: What Policies Work Best for Benefiting from the CMA?," IZA Policy Papers 163, Institute of Labor Economics (IZA).
    2. Luis Alberiko Gil-Alaña & Borja Balprad & Guglielmo Maria Caporale & Hector Carcel, 2015. "Exchange Rate Dynamics and Monetary Unions in Africa: A Fractional Integration and Cointegration Analysis," NCID Working Papers 11/2015, Navarra Center for International Development, University of Navarra.

    More about this item

    JEL classification:

    • C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes
    • C32 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes; State Space Models
    • F31 - International Economics - - International Finance - - - Foreign Exchange

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