To be sure, the verified use of money in a transaction is a one-off instance in TOS. Sort of.
That is, there are two movie instances as well. Scotty in ST6 says he bought a boat. Kirk in ST:GEN sold his cabin. Supposedly buying and selling involves money, although it could also involve barter or a futuristic system of compensation. But the point is that all the other TOS references save one can be interpreted as figurative or in jest.
When he does that, Spock rattles off a number but never reaches the end, and thus never adds "...and three point two two credits" or "...and five point nine three futurobucks". For all we know, he is speaking of hours.
"You've earned your pay", "I'd give real money" and so forth can easily be argued to equate "By Jove!" (no, the speaker doesn't worship Roman deities for real) or "We'll clean their chronometers" (no, the good Colonel is not in charge of the Timepiece Maintenance Department, and there need not even exist any chronometers in need of cleaning as of 2291). And apart from those, there is basically only one instance where our heroes attempt a conventional trade transaction in the 23rd century Federation environment: "Trouble with Tribbles".
Cyrano Jones and the bartender obviously believe in money, in setting a price, and in demanding payment, but funnily enough, no Starfleet officer ends up paying anything in the scene - neither for the tribble nor any drinks. It seems drinks are free elsewhere in TOS, too. Or then the invisible credit system just works very smoothly.
As for Kirk saying "we don't have" money in ST4, that could mean
1) money doesn't exist in his native time and place
2) he didn't get any of his money with him, at least not in any useful form
3) he's broke, as Starfleet froze his accounts
4) he's lying
Timo Saloniemi
That is, there are two movie instances as well. Scotty in ST6 says he bought a boat. Kirk in ST:GEN sold his cabin. Supposedly buying and selling involves money, although it could also involve barter or a futuristic system of compensation. But the point is that all the other TOS references save one can be interpreted as figurative or in jest.
Kirk asks him if he knows how much Star Fleet has spent on his training and Spock starts to quote the figure.
When he does that, Spock rattles off a number but never reaches the end, and thus never adds "...and three point two two credits" or "...and five point nine three futurobucks". For all we know, he is speaking of hours.
"You've earned your pay", "I'd give real money" and so forth can easily be argued to equate "By Jove!" (no, the speaker doesn't worship Roman deities for real) or "We'll clean their chronometers" (no, the good Colonel is not in charge of the Timepiece Maintenance Department, and there need not even exist any chronometers in need of cleaning as of 2291). And apart from those, there is basically only one instance where our heroes attempt a conventional trade transaction in the 23rd century Federation environment: "Trouble with Tribbles".
Cyrano Jones and the bartender obviously believe in money, in setting a price, and in demanding payment, but funnily enough, no Starfleet officer ends up paying anything in the scene - neither for the tribble nor any drinks. It seems drinks are free elsewhere in TOS, too. Or then the invisible credit system just works very smoothly.
As for Kirk saying "we don't have" money in ST4, that could mean
1) money doesn't exist in his native time and place
2) he didn't get any of his money with him, at least not in any useful form
3) he's broke, as Starfleet froze his accounts
4) he's lying
Timo Saloniemi