Those of us working in this field are still a small band

This paper extends interplanetary trade theory to an interstellar setting. It is chiefly concerned with the following question: how should interest rates 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 traveling with the goods than to a stationary observer. A solution is derived from economic theory, and two useless but true theorems are proved.

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From an abstract to “The theory of interstellar trade” by Paul Krugman, Nobel prize in economics 2008 winner.