Testing for Purchasing Power Parity using stationary covariates
Jomana Amara () and
David Papell ()
Applied Financial Economics, 2006, vol. 16, issue 1-2, 29-39
Purchasing Power Parity is tested for in post-Bretton Woods real exchange rate data from 20 developed countries using univariate tests and covariate augmented versions of the Augmented Dickey-Fuller (CADF) and feasible point optimal (CPT) unit root tests. The covariates are a combination of stationary variables - inflation, monetary, income, and current account. A cross method comparison of the results is performed. Very strong evidence is found of PPP using the CPT test, rejecting the unit root null for 12 out of the 20 countries at the 5% significance level or better, and six more at the 10% level. Much less evidence is found of PPP with the CADF and univariate tests.
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