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by AnthonyMouse
547 days ago
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If the bids are secret and the highest bidder pays what they bid then bidders have the incentive to try to bid strategically, i.e. less than what they'd be willing to pay as long as they think that's more than anyone else would be willing to pay. Plus, if there is someone who thinks it's worth way more than anyone else, they could just place a modest bid and then if they lose buy it from the winner for $1 more than what the winner values it at anyway. The way you can avoid this with secret bids is to specify that the highest bidder will pay $1 more than the second highest bidder no matter how high they bid. Then everyone has the incentive to actually specify the maximum they'd be willing to pay, because if the next highest bid is lower than that they still actually do want to buy it, but they lose nothing by bidding higher because they only pay a dollar more than the next highest bidder no matter what, and then you maximize bids. But by that point you don't benefit from keeping the high bid a secret anymore, because of human psychology. Someone bids $100, is the current high bidder and thinks they're getting to buy it, then someone outbids them and loss aversion kicks in so they make a higher bid, even though the first bid was supposed to be their max. |
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