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Anyone here who hasn't read Krugman's paper on the economics of interstellar trade owes it to themselves to do so:

http://www.princeton.edu/~pkrugman/interstellar.pdf

I've never laughed so hard that coffee went up my nose while reading an econ paper prior to coming across this one. (Okay, and maybe the first version of the Paulson bailout, but that was a very different sort of laughter.)

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This is GOLD.

"First Fundamental Theorem of Interstellar Trade: When trade takes place between two planets in a common inertial frame, the interest costs on goods in transit should be calculated using time measured by clocks in the common frame, and not by clocks in the frames of trading spacecraft."

and the final line for the kicker:

"Those of us working in this field are still a small band, but we know that the Force is with us."

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