Abstract
This study aims to investigate the purchasing power parity (PPP) hypothesis for 38 OECD member countries over the period 1994:M1-2021:M9 by performing Hepsag’s (2021) unit root test. It fills the gap in the literature since it is one of the first studies conducted performing a unit root test that considers structural change and nonlinearity for all OECD countries. The study, in which conventional unit root tests such as the ADF, KPSS, and the Fourier KPSS, which allow merely structural change, yield conflicting results regarding the validity of the PPP hypothesis, determines that the PPP hypothesis is valid for countries with stationary real effective exchange rates at the level such as Finland, France, Germany, Greece, Hungary, Iceland, Italy, Japan, Korea, Lithuania, Luxembourg, Mexico, Norway, Slovakia, Slovenia, Spain, Switzerland, Turkey, and the USA according to Hepsag’s (2021) unit root test results.
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