Problem
Use the dataset AIRFARE1.DTA. This dataset comes from the US Department of Transportation and reports the average one-way airfare price for the year 2000 between a large numbers of US cities. It also contains a measure of the level of airline competition. The variable concern is the fraction of the total passengers on the route served by the airline that carried the most passengers on the route. Run a regression of ln(fare) on concern with ln(dist) included as a control variable. What is the predicted percentage change in price associated with a 0.1 increase in concern holding distance constant? Report your numerical answer as a percent [0 to 100] with one decimal.