Long-Run PPP May Not Hold After All
نویسنده
چکیده
Recent tests using long data series find evidence in favor of long-run PPP. These tests may have reached the wrong conclusion. Using artificial data calibrated to nominal exchange rates and disaggregated data on prices, we show that tests on long-run PPP have serious size biases. In the baseline case, unit root and cointegration tests with a nominal size of 5% have true sizes that range from 0.90 to 0.99 in 100-year long data series, even though there is a permanent component that accounts for 42% of the 100-year forecast variance of the real exchange rate. Tests of stationarity are shown to have very low power in the same circumstances. 2000 Elsevier Science B.V. All rights reserved.
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