This article gives an in-depth picture of the use of money in the Star Trek universe.  “Gene Roddenberry had a rule — one of those rules that the scriptwriters of Star Trek had to know and follow: in the Federation there is no money, period!”

Of course, money almost certainly has to exist.  Trade is frequently portrayed throughout the show, and real-life societies have failed to come up with a functioning money-free society.

Even in the future, in a time of plenty, the laws of economics continue to exist.

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