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∏A = gUG + min(k-g, (1-g)(1-r))

Economist Makoto Watanabe has calculated that the optimum time to buy an airline ticket is eight weeks in advance of flying. His findings also suggests that airline tickets are cheaper in the afternoons than the mornings. The results stem from work published in the Economic Journal in which Watanabe and his colleague, Marc Möller, offer equations such as ∏A = gUG + min(k - g, (1 - g)(1 - r)) as part of the complex formula that determines advance ticket purchases.

http://www.guardian.co.uk/world/2010/aug/22/airline-ticket-eight-week-rule/print

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