Money
Money as a made-up social technology.
Goldstein traces money’s history with the rare combination of intellectual clarity and accessible prose, landing on the insight that every form of money has been a social technology — a shared agreement — rather than a natural phenomenon. It is a short book, but the core argument is load-bearing for anyone building payment infrastructure: the system you are building is not encoding objective value but constructing a shared fiction that will be as durable as the trust it can sustain.