Erasing? Not necessarily. Why would you accept the latter episode but not the former? What makes one more authoritative than the other? Airdate? That seems rather flimsy.
The offending scene in "In the Cards" is just a conversation between Jake and Nog. Something tells me that the situation must be a bit more complicated than those two would be able to describe. Me, I'd be more likely to accept the situation as we see it in "Farpoint," where we actually SEE the Federation economy in action, in a way.
Agreed-and a good example--if they left it at that.
But therein lies the problem. We have two examples--one earlier one suggests humans use some type of credit--but the later ones flat out say that humans don't use money at all--
Either one cancels out the other-- in this case, it's too black and white.
Jake is not saying, 'Hey I'm a teenager with no job, I don't have any money', he's saying he doesn't have any money because he's a human. That's no ordinary conversation.
We also have to remember there are at least two other statements from other Trek characters that state humans don't use money;
Tom Paris: When the New World Economy took shape in the late 22nd century and money went the way of the dinosaur, Fort Knox was turned into a museum.
JAKE: Not always. I sold my first book today.
QUARK: Really? How much did you get for it?
JAKE: It's just a figure of speech. The Federation News Service is going to publish a book of my stories about life on the station under Dominion rule.
QUARK: And they're not paying you?
JAKE: No.
QUARK: Well then, you have my sympathies and the first round of drinks is on the house.
JAKE: Really?
QUARK: No. It's a figure of speech
Why didn't Jake get paid his credits for selling his book? How does this guy ever do anything, he never has money or credits

Even if it's electronic currency in the form of credits-it would still be money or treated as money. It accumulates, it gets depleted, it has to be earned, it has to be "stored" somewhere.
Those damning statements about money don't leave much wiggle room.
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