Le marché détermine la devise, le catalogue et les paiements, sans changer la langue.
English
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? This is a problem because the time taken in transit will appear less to an observer. A solution is derived from economic theory, and two useless but true theorems are proved.
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