Nevertheless, we also get references to rents, remittances, stakes, compensation and even the compulsory face of future finance, the credit. The equivocation is neatly captured in TOS Episode "The Apple," when Kirk snaps at Spock (and not for the first time I bet), "Do you know how much Starfleet has invested in you?" Spock responds something like, "Twenty-two thousand, two hun--" and is rather tellingly interrupted before he can finish, "--dred and forty three clams and eighty seven point one four pence, Captain. Why, what's up?" It's a discrepancy can be reconciled in various ways, which I hope to look at in some detail elsewhere.
I think the post-scarcity of Star Trek is worth comparing to that of Iain M. Banks's Culture, with which it has similarities.
There has been a fair bit written about Star Trek economics, most notably Manu Saadia's Trekonomics:
Trekonomics from Inkshares on Vimeo.