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Facing up to the polysemy of purchasing power parity: New international evidence

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  • Xie, Zixiong
  • Chen, Shyh-Wei
  • Hsieh, Chun-Kuei

Abstract

The purchasing power parity (PPP) hypothesizes the real exchange rate to be a stationary process. Since the test results are model-dependent, the hypothesis has long been debated. This paper makes a new contribution to the PPP debate by exploring why the PPP is more robust to model specification in some countries than others. To this end, we adopt a variety of the state-of-the-art unit root tests, which are categorized into four versions of the PPP, according to whether the exchange rate process is level (trend) stationary with temporary (permanent) structural break(s). We then investigate why one or more versions of the PPP hold for specific countries. By using the real effective exchange rates of 23 OECD countries plus the euro area, we find that the size of GDP, the membership of the euro area, and the government debt-to-GDP ratio have significant effects on the validity of the PPP hypothesis.

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  • Xie, Zixiong & Chen, Shyh-Wei & Hsieh, Chun-Kuei, 2021. "Facing up to the polysemy of purchasing power parity: New international evidence," Economic Modelling, Elsevier, vol. 98(C), pages 247-265.
  • Handle: RePEc:eee:ecmode:v:98:y:2021:i:c:p:247-265
    DOI: 10.1016/j.econmod.2021.02.019
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    Keywords

    Purchasing power parity; Real effective exchange rate; Unit root; Structural break;
    All these keywords.

    JEL classification:

    • C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes
    • F31 - International Economics - - International Finance - - - Foreign Exchange
    • F45 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Macroeconomic Issues of Monetary Unions

    Statistics

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