As noted, the idea is predicated on replicators.
Are replicators believable? Well, if they convert a given amount of mass into another thing of equal mess, then, well... I guess. All mass has therefore an equal value, and so there's no rarities to make purchases of.
Economy comes down to how often you use the replicator, like 'replicator rations' on VOY (the 'rations' being no doubt substituted for 'latinum' - and bam: The Ferengi economy). The difference between the Federation and the Ferengi may simply be accounted by privatized replicators in the former, and socialized replicators in the latter.
Replicators: The gimmick that makes a fully socialized state system kinda make sense. I guess.
Are replicators believable? Well, if they convert a given amount of mass into another thing of equal mess, then, well... I guess. All mass has therefore an equal value, and so there's no rarities to make purchases of.
Economy comes down to how often you use the replicator, like 'replicator rations' on VOY (the 'rations' being no doubt substituted for 'latinum' - and bam: The Ferengi economy). The difference between the Federation and the Ferengi may simply be accounted by privatized replicators in the former, and socialized replicators in the latter.
Replicators: The gimmick that makes a fully socialized state system kinda make sense. I guess.