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[Link] Sparrows may be vulnerable to sunk-cost-like effects — LessWrong
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Agreed that it's not quite the same - that's why I had to say "sunk-cost-like".
Perhaps, but the sparrows are (presumably) unaware that any sort of transaction is being made. Although I suppose it's possible that they dimly perceive that the apparatus which they are interacting with is somewhat agent-like, the same way we might view a vending machine as more agent=like than a plant even if we didn't know that someone had fashioned it with the intention of trading with us.
But even so - they've already sampled the rewards that each choice provides during the training tasks. So if you've tasted the candies and know what you are getting, why should it matter how much the other person thinks they should cost?
I that case it's probably a difference in being able to know how much effort you've put in versus knowing how much reward you got, which is a problem.