Pesaran, M. Hashem; Smith, Ron P.; Yamagata, Takashi; … - CESifo - 2006
In this paper we adopt a new approach to testing for purchasing power parity, PPP, that is robust to base country effects, cross-section dependence, and aggregation. Given data on N +1 countries, i, j = 0, 1, 2, ..., N, the standard procedure is to apply unit root or stationarity tests to N...