Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In this paper, the authors assert that most studies that have sought to determine the validity of purchasing power parity are flawed for two reasons. First, post-1973 data contain, by definition, only a very limited amount of the low-frequency information relevant for examination of long-run parity. Second, the dynamic econometric techniques used to model deviations from parity are typically quite crude with respect to admissible low-frequency dynamics. Both deficiencies are rectified in the present paper, with dramatic results. With a new longer data set, the authors study deviations from parity using long-memory models that allow for subtle forms of mean reversion. Copyright 1991 by University of Chicago Press.