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Misha comments on Harry Potter and the Methods of Rationality discussion thread, part 13, chapter 81 - Less Wrong
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What happens if multiple wizards try to Time Turner the stock market? Information can't travel back more than six hours in time. So if Wizard #1 sees a stock price falling, and goes back in time to sell, and Wizard #2 sees effects of that, and goes back in time to sell, weird things happen.
I'm not sure what the six-hour limitation on information actually does, though. We see Bones asking Dumbledore, "I have information which I learned four hours into the future, Albus. Do you still want it?" Dumbledore weighs the value of the information against the value of going back in time more than 2 hours. However, if he rejects that information, and goes back in time 3 hours, he still brings back the knowledge that Bones will have information to share. How exactly does that work?
The impression I got was that the Time Turner would fail to work. Thus, if Bones tells D, then D uses his Time Turner, he only goes back 2 hours.
That's an interesting thought, actually. Can you prevent a person from going back in time by essentially giving them information from the future, even if they don't know it is information from the future?