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

Venus Khim-Sen Liew ()

International Finance from EconWPA

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.

Keywords: Purchasing power parity; Mean reversion; ASEAN economies; Real exchange rates; Non-linear unit root. (search for similar items in EconPapers)
JEL-codes: F31 (search for similar items in EconPapers)
Date: 2003-08-03
Note: Type of Document -
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Persistent link: http://EconPapers.repec.org/RePEc:wpa:wuwpif:0308001

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