It is well known that unit root limit distributions are sensitive to initial conditions in the distant past. If the distant past initialization is extended to the infinite past, the initial condition dominates the limit theory producing a faster rate of convergence, a limiting Cauchy...

This paper consists of two parts. In the first part the sensitivity of PPP testing to the nature of the unit root tests is demonstrated. Three unit root tests are employed for fourteen real bilateral exchange rates. The first two, the augmented Dickey-Fuller test and the Phillips-Perron test are...