What if the Galleons are actually fake gold created by Goblins, and they can tell 'fake' currency because it's real?
You're suggesting that there are two substances, difficult to tell apart, both called "gold". On what grounds does one decide which to think of as "the real thing" and which to think of as "an imitation of the real thing"?
On the grounds that if the goblins can tell them apart, there must be some difference. Remember, something doesn't need to have a physical use to have value - see Bitcoin, or intellectual property, or stock options. Simple scarcity is sufficient to create value if people decide to value it.
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: