Well a few things, first its in the 23rd century, and still VERY capitalist, of the main 5 nations talked about I know for a fact 3 of them capitalists. of the remaining 2 their entire plot point is that they are secretive and no one knows what they want, and the other has a cast system with a religious, warior and the Wiki says worker but I have yet to see it in the show because I am early on, but they are still a maybe.

For one of the 3 I can confirm I dont know much about their society or economy so I will not say much,

The second I know still has slavery, and is otherwise a dieing empire, though they call it a republic yet its very clearly based on the roman empire.

The 3rd is the humans, this is where I have found the most amount. First as far as I can tell its as if the United States annexed the rest of the world then abolished the house of representatives, and the US has not fixed any of its problems instead activly making it worse, in one episode its mentioned a doctor providing free medical care is illegal, I cannot stress enough that this is the 23rd century on a Space Station, and there are slums, and homeless people, but it is never shown as a “bad” thing but as a fact of life, and there are mentions of just exicuting all the poors as a way to lower crime. and please note, that the humans do not have any “free air”/“free soil” laws that automaticly free slaves when they enter their territory or space stations, and are willing to hold diplomatic relations with said nation, without bringing this point up, it was almost brought up like a throw away plot point.

There are large corperations that are given near governmental powers or greater.

My final gripe needs a direct comparison to DS9, both of them had a Unionism episode, where workers where pushed to the breaking point, both of them the strike was technically illegal, in DS9 the Union and the men in the Union where the Heros, as they “Where more than heros [they] where union [men]” and they had “Nothing to lose but there chains” the fact it was illegal was used to set the stakes, in B5 the union is there, and they mention multiple times that it is an illegal strike as a way to disparage the strike, the hero is the commander of the station for generously lessening his budget to give a minimal increase on the prevision they would start work immediately, there was no proper negotiations it was take it or everyone arrested, and the Union was a villan all be it the more sympathetic one of the 2 in the episode, where the correct answer was the middle, that more helps capital.