[New info reduces ignorance, changes the probability.] If that sounds mystical or paradoxical, think about the probability that a coin I just flipped landed heads. For you, it's .5. For me, it's 1 (I peeked). Same event, different knowledge, different probability. #StevenPinker

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Adam Smith called it the paradox of value: when an important good becomes plentiful, it costs far less than what people are willing to pay for it. The difference is called consumer surplus, and the explosion of this surplus over time is impossible to tabulate. #StevenPinker