wedrifid comments on Harry Potter and the Methods of Rationality discussion thread, part 13, chapter 81 - Less Wrong
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It is. Winning on the stockmarket with this time-travel system is barely any different (in terms of mere physics) than using it as a sleep aid.
In a fantasy world this ad hoc most of the wizarding population has to be holding the idiot ball most of the time for things to be as they look in the story.
We're talking about Eliezer!HP, not Rowling!HP.
If using time travel in this way is possible (I maintain it already has been explained it isn't), that opens up a million plot holes and so I predict EY won't go there.
You are wrong. We've already seen more complicated information exploitation scenarios than this.
Narrative necessity dictates that he probably won't.