I am trying to recall the bar scene in the Star Trek 2009 movie, now Kirk wanted to buy Uhura a drink, if money does not exist the drinks would be free, why would a male use one of the oldest pick up actions i.e offering to buy someone (a female) a drink, if the drinks are free?![]()
I agree that money definitely exists in TOS era, and think that it seems to lessen in importance in the TNG/DS9 era.
But in that scene in Trek ‘09, I feel like it could just be an old saying used for that occasion (“Buy you a drink.” could just mean “Get you a drink.”, with the connotation of flirtation.) Or it could literally mean buying someone a drink.
I say this because we still use phrases in different languages today to connote a specific meaning without understanding the origin of that phrase. For example, I’ve said “Break a leg!” without understanding where that term comes from historically.
But yeah, money still exists in TOS.