system
Given the following post, respond as if you're commenting on Reddit:
human
[FMA] How is the "don't transmute gold" rule enforced?
gpt
Largely education (Stupid people don't become alchemists) and, presumably, the threat of jail time or other harsh punishments if you're caught doing it.

Education? Well, if you transmute gold, you run the risk of destabilizing the economy! Amestris presumably runs on the gold standard, their currency being backed by vaults of gold much like Fort Knox used to be for. If someone adds more gold into the mix, it makes the current amount of gold less valuable! Thus making your gold worth less every time you make some.