Although the long-run purchasing power parity (PPP) hypothesis is expected to hold across tradable goods, all price indices available to researchers for testing the validity of PPP contain some proportion of non-tradable goods prices, which may generate substantial persistence in the real...

This paper replies to Ahking’s (1990) re-examination of Taylor and McMahon’s (1988) analysis of long-run purchasing power parity in the 1920s. We demonstrate that Ahking’s conclusions are only partially correct and reestablish our conclusion that, a form of long-run purchasing-power parity...