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JoshuaZ comments on Harry Potter and the Methods of Rationality discussion thread - Less Wrong
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One more thought, this time money related stuff:
On the one hand, the magical and muggle economies are sufficiently separated that Gringots seems to not even notice the possibility of arbitrage...
But on the other hand, we're told that anyone who transfigures stuff to look like money, even muggle currency, is legally at war with the goblins. If the goblins are tracking muggle money enough to at least notice this sort of thing and care about it, that seems at odds with them being sufficiently ignorant of the muggle economy to not notice the arbitrage possibilities.
The goblins may only use that to check for Muggle currency that wizards try to turn in to the goblins. They may also have methods that just track objects transfigured to look like Muggle money. If goblins have similar cognitive flaws as humans, then they might be able to keep track of the economy for this one very specific purpose and not even realize that arbitrage was really a useful practice.
That seems plausible.