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Paul Krugman was just awarded the Nobel Prize in the field of Economics.

In 1978, he wrote a 15-page paper.  From the abstract:
  This paper extends interplanetary trade theory to an interstellar setting.  It is chiefly concerned with the following question: how should interest charges on goods in transit be computed when the goods travel at close to the speed of light?
(Warnings: PDF file; Total nerd-fest)
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