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by anovikov
1096 days ago
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Easy, there's a known correlation between cost of air travel and fly vs drive tradeoff decision consumers take. Conveniently, price of travel tends to vary, independent of all other variables, with the price of oil to produce jet fuel, and at a law different from the one of variation of cost of road travel for the same reason, thus providing an easy way to measure how people make that decision (highway travel miles variability is measured by gasoline sales variability and number of air tickets sold daily is also known). So they know how many people will drive instead of flying if price of a ticket increases by X% without anything else changing. |
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QED