[dukemagic]

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You are making a mistake in your evaluation. Hint: in all cases you are guaranteed the minimum amount.

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Do you mean that in all cases I expect the other envelope to have more money, no matter what I do? Is that all there is to it? So what is the correct plan of action in this case? I'm guessing it's irrelevant whether or not you switch pre-opening, but you always want to switch post-opening. Is that correct?