Assuming some kind of "warp gate" or "Space lane" that makes FTL travel between different stars feasible... What goods would be most likely to be traded? Especially, what would Earth want to import vs export compared to colony planets.
To expand on this, I'm developing a "space trading" game where you haul goods from one system to the next (similar in some ways to the Empire Builder Rails games and I'm trying to pick about 10-20 cargoes (colonists would likely be a cargo!) that would make thematic sense to import or export from Sol and it's various colonies.