Whats the psychology behind this
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Because the individuals who enjoyed the feeling of getting a deal on something tended to do better in nature so they outnumbered the ones that didn’t because they had more kids and longer lifespans, so basically natural selection.
Pretty much any question you might have about biological organisms is answered by “because natural selection”.
Although natural selection might select for a certain trait if it’s “hardcoded” like an instinct it might not work anymore if you change the organisms environment, so that would be what a bias is. So we have evolved biases like looking for relative value as that would be helpful to judge most of the time, but when it’s not it could cause us to make an illogical decision.
But you know, even a broken clock shows the right time two times a day, so if that’s enough for natural selection to not push for better it’s good enough.
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