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How would an interstellar trading empire figure out how long goods had been in transit, for the purposes of calculating interest? After all, if the shipping vessels are traveling at close to the speed of light, the shipping time will seem longer to an observer on the ground than it would to someone traveling on the ship. This is apparently the sort of thing rockstar economist Paul Krugman thinks about when he's not prophesying our total doom. Click through for Krugman's solution to this thorny problem. More »
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