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field experiments

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    Incentive Design Entry #0376

    Why paying for blood donations reduced supply

    Adding money to a voluntary act can reduce how often it is performed, because the payment replaces the reason people were doing it at all.

    Novice
    The hidden part #0376

    A payment does not only add a motive. It can delete the one that was already there.

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    Persuasion Systems Entry #0255

    Why authority is signalled by objects, not arguments

    Authority is read off uniforms, titles, desks and clipboards long before any claim is examined, and the signal keeps working when the claim is absent.

    Master
    The hidden part #0255

    Authority is inferred from props, and props can be acquired far more cheaply than expertise.

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