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Is PPP sensitive to time-varying trade weights in constructing real effective exchange rates?

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  • Bahmani-Oskooee, Mohsen
  • Hegerty, Scott W.
  • Kutan, Ali M.

Abstract

While the use of real effective exchange rates in stationarity tests of purchasing power parity (PPP) avoids the problems created using bilateral rates, these rates are often constructed using trade shares that are fixed at a single base year. This method fails to take into account the fact that trade shares can change drastically in parts of the world that are undergoing dramatic transformations. In this study, we apply linear as well as nonlinear stationarity tests to 52 currencies' real effective rates, which were constructed using time-varying weights. Incorporating a time trend, we are also able to assess whether breakdowns in PPP are due to productivity differentials. We find that while nonlinear tests provide more evidence of "productivity bias" than do linear tests, they do not provide much more evidence of PPP. A comparison to a previous study that used fixed-weight data shows that there is somewhat more evidence of productivity bias using the new dataset, especially in Eastern Europe and Asia. We can conclude that PPP and a key cause of its breakdown are somewhat sensitive to the use of time-varying weights in these stationarity tests.

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  • Bahmani-Oskooee, Mohsen & Hegerty, Scott W. & Kutan, Ali M., 2009. "Is PPP sensitive to time-varying trade weights in constructing real effective exchange rates?," The Quarterly Review of Economics and Finance, Elsevier, vol. 49(3), pages 1001-1008, August.
    • Handle: RePEc:eee:quaeco:v:49:y:2009:i:3:p:1001-1008
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    2. Su, Jen-Je & Cheung, Adrian (Wai-Kong) & Roca, Eduardo, 2014. "Does Purchasing Power Parity hold? New evidence from wild-bootstrapped nonlinear unit root tests in the presence of heteroskedasticity," Economic Modelling, Elsevier, vol. 36(C), pages 161-171.
    3. Aloy, Marcel & Boutahar, Mohamed & Gente, Karine & Péguin-Feissolle, Anne, 2011. "Purchasing power parity and the long memory properties of real exchange rates: Does one size fit all?," Economic Modelling, Elsevier, vol. 28(3), pages 1279-1290, May.
    4. Frederick H Wallace & Daniel Ventosa-santaulària & Manuel Gómez-zaldívar, 2014. "Is The Real Effective Exchange Rate Biased Against the PPP Hypothesis?," Economics Bulletin, AccessEcon, vol. 34(1), pages 395-399.
    5. Siphat Lim, 2021. "Testing Purchasing Power Parity in Cambodia: Time-Varying Trade Weights in Constructing Real Effective Exchange Rate," International Journal of Economics and Financial Issues, Econjournals, vol. 11(3), pages 146-153.
    6. Burak Güriş & Muhammed Tiraşoğlu, 2018. "The Validity of Purchasing Power Parity in BRICS Countries," Prague Economic Papers, Prague University of Economics and Business, vol. 2018(4), pages 417-426.
    7. Ahmad Zubaidi Baharumshah & Siew-Voon Soon, 2012. "Mean reversion in bilateral real exchange rates: evidence from the Malaysian ringgit," Applied Economics, Taylor & Francis Journals, vol. 44(22), pages 2921-2933, August.
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