Purchasing Power Parity as a Long-Run Relation
Dickey-Fuller and Stock-Watson tests of purchasing power parity (PPP) as a long-run proposition are provided within the cointegration framework proposed by Granger. Since different countries use different weights to construct price indices, the traditional constraint that the coefficients on the price indices should be unity in the log-linear PPP relations is relaxed. The absence of a general PPP relation cannot be rejected. At most, a PPP relation is indicated in five out of fifteen country pairs that are examined. Even if a long-run PPP relation exists, it is not found to be useful in predicting future nominal exchange rates, which is consistent with efficient speculative markets. Copyright 1990 by John Wiley & Sons, Ltd.
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Volume (Year): 5 (1990)
Issue (Month): 4 (Oct.-Dec.)
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