I think I've read a study that had different conclusions using a donation bucket as measurements, meaning the participants where not aware their behaviour was recorded. Is there a meta analysis that you know of?
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You've posted a couple citations with this same conclusion and I read the paper I'm referring to years ago and can't remember the details about it's scientific merit, but if there is a discrepancy, I'd love to see a systematic review to clear things up.
End of conversation
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