Both 0% and 100% weigh far more heavily in our minds than the mathematical models of economists say they should.8 Again, this is not surprising if you think about the world in which our brain evolved. There was always at least a tiny chance a lion was lurking in the vicinity. Or a snake. Or someone who covets your hut and is carrying a club. Or any of the countless other threats people faced. But our ancestors couldn’t maintain a state of constant alert. The cognitive cost would have been too great. They needed worry-free zones. The solution? Ignore small chances and use the two-setting dial
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