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@hypolite Kim Stanley Robinson's Red/Green/Blue Mars series introduces a collective with a gift economy, but they're not central.

Daniel Abraham's Dragon and the Coin series (outstanding) revolves around bankers, but throughout the events of the book they develop fairly standard economic ideas of fiat currency and exchange rates. Quite well done, though.

Dave Duncan's Reluctant Swordsman series has a bit about how trade works in a non-literate society that can't sign contracts.