You might be surprised to learn that the well-known economist Paul Krugman wrote in the late 70s about trade in relativistic scenarios, see https://en.wikipedia

You might be surprised to learn that the well-known economist Paul Krugman wrote in the late 70s about trade in relativistic scenarios, see https://en.wikipedia.org/wiki/The_Theory_of_Interstellar_Trade https://en.wikipedia.org/wiki/The_Theory_of_Interstellar_Tra... and http://www.standupeconomist.com/pdf/misc/interstellar.pdf http://www.standupeconomist.com/pdf/misc/interstellar.pdf (for the paper itself).