Ca' Zorzi, Michele; Chudik, Alexander - European Central Bank - 2013
This paper studies the influence of aggregating across space when (i) testing the PPP theory or more generally pair …-wise cointegration and (ii) evaluating the PPP puzzle. Our contribution is threefold: we show that aggregating foreign data and applying … an ADF test may lead to erroneously reject the PPP hypothesis. We then show, on the basis of theoretical arguments as …