What did it mean if people’s prediction of the misery that might be caused by some event was different from the misery they actually experienced when the event occurred, or if people’s memory of an experience turned out to be meaningfully different from the experience as it had actually played out? A lot, thought Danny. People had a miserable time for most of their vacation and then returned home and remembered it fondly; people enjoyed a wonderful romance but, because it ended badly, looked back on it mainly with bitterness. They didn’t simply experience fixed levels of happiness or
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