A bootstrap panel unit root test under cross-sectional dependence, with an application to PPP

A bootstrap methodology for dealing with cross-sectional dependence in panel unit root tests of real exchange rates is suggested. Monte Carlo simulations are employed to investigate the size distortion and the power of the bootstrap test-statistic. It is shown that the statistic has good power and no size distortions for moderate and large samples. The panel unit root test procedure is then applied to the long-run purchasing power parity (PPP) hypothesis, using a panel of 20 OECD countries over the recent float period, and the results are compared to those obtained by other tests.