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AspiringRationalist comments on Evaluability (And Cheap Holiday Shopping) - Less Wrong
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Hmmm...
29/36 * $2.00 = $1.61 7/36 * $9.00 = $1.75
While the average prices (equivalence values) placed on these options were $1.25 and $2.11 respectively
I guess people don't carry calculators with them?
All psychologically normal people carry a calculator between their ears. Most are just too lazy to use theirs, even for easy problems like this, which is the source of many biases.
I'd say embarrassment is a bigger issue than laziness. People don't want to be seen as nerdy, especially about little things. Also, if some people are slow at mental math, they wouldn't want others to know that.