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RobinZ comments on Newcomb's Problem and Regret of Rationality - Less Wrong
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If you say this, then you believe in backwards causality (or a breakdown of the very notion of causality, as in Kevin's comment below). I agree that if causality doesn't work, then I should take only Box B, but nothing in the problem as I understand it from the original post implies any violation of the known laws of physics.
If known physics applies, then Omega can predict all it likes, but my actions after it has placed the boxes cannot affect that prediction. There is always the chance that it predicts that I will take both boxes but I take only Box B. There is even the chance that it will predict that I will take only Box B but I take both boxes. Nothing in the problem statement rules that out. It would be different if that were actually impossible for some reason.
I knew that you wouldn't, of course, since you're a one-boxer. And we two-boxers will not regret taking both boxes, even if we find Box B empty. Better $1000 than nothing, we will think!
Alicorn:
TobyBartels:
I remember reading an article about someone who sincerely lacked respect for people who were 'soft' (not exact quote) on the death penalty ... before ending up on the jury of a death penalty case, and ultimately supporting life in prison instead. It is not inconceivable that a sufficiently canny analyst (e.g. Omega) could deduce that the process of being picked would motivate you to reconsider your stance. (Or, perhaps more likely, motivate a professed one-boxer like me to reconsider mine.)