Ok, Since we now have privateers (bandits which don't directly tie back to us) a galactic black market would be a nice feature.
Civs offer up things they are willing to trade, and/or you can request resources and civs give you a price.
It's really a pain going through 30+ civs to find which has the resource you are looking for then trading for it. Markets have been around since trading began, so it would only seem logical they exist in the space....
