The Federation trades with other species on a regular basis.
They merely don't use money/currency to accomplish it, but rather resources, scientific knowledge, technologies, etc ... you know ... things that certain species might find invaluable in comparison to currency.
Janeway for example traded 145 (I think it was that many) Isolinear chips for an Isokinetic cannon.
They also created a Federation based alliance in the Void in season 7 which purpose was in fact sharing of technology and resources through a basic trade system and nothing more (something the actual federation was doing).
Heck ... Janeway even gave to one alien captain a phase compensator for nothing in return ... which in the long run resulted for the said captain to join the alliance that drew other ships to join and Voyager also gained technology that tripled replicator efficiency using 50% less power than they did before ... not to mention that through such cooperation, ships in the alliance fared far better with sharing resources and technologies than when they were separate ... which also lead to the creation of a specific field generator that was required for the alliance to escape the void (and the work on the generator would have been much slower if Be'Lanna didn't have help from their allies).
I would say the said system works.
They merely don't use money/currency to accomplish it, but rather resources, scientific knowledge, technologies, etc ... you know ... things that certain species might find invaluable in comparison to currency.
Janeway for example traded 145 (I think it was that many) Isolinear chips for an Isokinetic cannon.
They also created a Federation based alliance in the Void in season 7 which purpose was in fact sharing of technology and resources through a basic trade system and nothing more (something the actual federation was doing).
Heck ... Janeway even gave to one alien captain a phase compensator for nothing in return ... which in the long run resulted for the said captain to join the alliance that drew other ships to join and Voyager also gained technology that tripled replicator efficiency using 50% less power than they did before ... not to mention that through such cooperation, ships in the alliance fared far better with sharing resources and technologies than when they were separate ... which also lead to the creation of a specific field generator that was required for the alliance to escape the void (and the work on the generator would have been much slower if Be'Lanna didn't have help from their allies).
I would say the said system works.