USPPIUnited States Principal Party in Interest (international sales)
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[DELTA]ln(e) = [DELTA]ln(USPPI) - [DELTA]ln(MXPPI).
[DELTA]ln(e) = [[beta].sub.0] + [[beta].sub.1][DELTA]ln (USPPI)-[[beta].sub.2]ln (MXPPI).
Seasonally adjusted data regarding the PPI in Mexico were not readily available at the time of this study, hence the exchange rate and USPPI were also chosen to be not seasonally adjusted so as to be consistent throughout the model.
The consistency of the other three tests will be weighed more heavily so this study finds the log of USPPI to be integrated of order 1.