Don't.
It's nonsense and all we know is that at least Earth doesn't use money and everyone apparently works or lives for the "greater good" of things or whatever. There's apparently no economy in the Prime universe Earth. I've asked about how it works and nobody really ever knows. I guess due to near unlimited resources or whatever, people can just decide to sit around and do nothing or pursue their own personal artistic or intellectual goals while living just as good as everyone else. What stops Tom Paris from going into a bar and ordering as many beers as he wants without ever worrying about paying for it? None of it makes sense and it was Roddenberry's idea of a utopian future which nowadays is unrealistic. I guess that's why Abrams has stated that the Alternate Universe does indeed have a currency system.
I don't think it's all that unreasonable.
There's a great line in Bioshock about how you can't build your own utopia predicated on being exceptional, because someone still has to scrub the toilets. But that's not an issue in a world like Star Trek where you live in a world where you can replicate anything you can program. We can hardly fathom that kind of world because it does seem so far away from our current society but we're already seeing the very beginnings of it in small ways with things like digital media and 3D printing.
(To me there can only be two theoretical constraints--space, and energy. The energy thing doesn't seem to be any issue except on things like ships. Assuming that the Trek world follows current sociological trends I'm assuming space isn't an issue, there's plenty of room for everyone. However living in a world with no currency does make me wonder how things like apartment hunting in NYC would work out. Do you lend out a room to the person you like the most or something?)
In sort, I'm saying that there are a lot of potential issues with the Trek economy, but we're starting at a disadvantage; we're born into a world where there is literally no other example to look to.