for a break from our research, check out here an (old) paper from Krugman that I recently came across. Below is the abstract of the paper:
'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 travelling with the goods than to the stationary observer. A solution is derived from economic theory, and two useless but true theorems are proved.'