U.S. visitors to Mexico increased by 120% between 1970 and 1987. Mexico's booming travel industry has increased nominal revenues from the U.S. by 375% and expenditures per tourist by 116% during this time period. Adjusting these data by a ratio index gives a more vivid picture of the impact of inflation and the peso devaluations over time. Trends in U.S. tourist expenditures to Mexico are shown to parallel exactly the movements of the ratio index bases on relative prices and exchange rates. Our modified regression analyses indicate that both real U.S. disposable income and the ratio index are excellent independent variables for the purpose of predicting number and expenditures of U.S. tourists to Mexico. Further, U.S. tourism numbers and expenditures are elastic with respect to each of these variables. The inconsistency between these results and past estimate may be the result of multucollinearity or autocorrelation in their data.