Answer: Airline travel
Source: http://www.aei-ideas.org/2012/10/even-with-baggage-fees-the-miracle-of-flight-remains-a-real-bargain-average-2011-airfare-was-40-below-1980-level/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+aei-ideas%2Fcarpe-diem+%28AEIdeas+%C2%BB+Carpe+Diem%29
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