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The Validity of PPP Revisited: An Application of Non-linear Unit Root Test

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  • Venus Khim-Sen Liew

    (Universiti Putra Malaysia)

Abstract

To this end, the validity of purchasing power parity (PPP) remains a controversial issue, as empirical evidence is inconclusive. This study provides robust empirical evidence to support the view that negligence of non-linearity may be the culprit of these contrasting findings. This paper demonstrates that the non-linear unit root test proposed by Kapetanois et al. [Journal of Econometrics, 2003, 112, pp.359-379] is able to reject unit root in 4 out of 5 cases, implying that deviations of exchange rates is mean reverting towards the PPP equilibrium values from the non-linear perspective, whereas the augmented Dickey-Fuller (ADF) test fails in 4 out of 5 cases. Thus, previous conclusions of the invalidity of PPP may be due to misleading results from the ADF test, which has low power against non-linearity.

Suggested Citation

  • Venus Khim-Sen Liew, 2003. "The Validity of PPP Revisited: An Application of Non-linear Unit Root Test," International Finance 0308001, University Library of Munich, Germany.
    • Handle: RePEc:wpa:wuwpif:0308001
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    References listed on IDEAS

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    Cited by:

    1. Nikolaos Giannellis & Athanasios Papadopoulos, 2007. "Estimating the Equilibrium Effective Exchange Rate for Potential EMU Members," Open Economies Review, Springer, vol. 18(3), pages 307-326, July.
    2. Nikolaos Giannellis & Athanasios P. Papadopoulos, 2006. "Purchasing Power Parity among Developing Countries and their Trade-Partners. Evidence from Selected CEEC and Implications for their Membership of EU," Ekonomia, Cyprus Economic Society and University of Cyprus, vol. 9(1), pages 39-56, Summer.

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    More about this item

    Keywords

    Purchasing power parity; Mean reversion; ASEAN economies; Real exchange rates; Non-linear unit root.;
    All these keywords.

    JEL classification:

    • F31 - International Economics - - International Finance - - - Foreign Exchange

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