Maybe the goblins have established some sort of monopoly on Galleon production, and regulate the amount of it that may be produced in one year? Plausibly the wizards might support that kind of a monopoly to prevent rampant inflation and destabilization of the economy.
Even if their knowledge of economics hadn't caught up with muggles and they were still thinking in mercantilist terms (and so didn't properly understand the concept of inflation), they could still understand that things will remain more stable that way. There have always been monopolies on the production of the official currency, with counterfeiters being harshly punished, and the (guild-like) goblins controlling it would fit with the general "old-fashioned" nature of the wizarding world.
If the goblins allow wizards to bring in gold to be minted, as Griphook told Harry, then how would they decide what wizards to work with? Every wizard can steal an effectively unlimited amount of gold from Muggle vaults. If many wizards did so, and then the goblins refused to turn most of that gold into Galleons, this would probably act to break their monopoly as a market in gold and/or other coins naturally emerged.
Unless wizards all agree not to value raw gold at all, only Galleons. That seems implausible.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 97. The previous thread is at nearly 500 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system.
Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: