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The generalized second-price auction (GSP) is a non-truthful auction mechanism for multiple items. Each bidder places a bid. The highest bidder gets the first slot, the second-highest, the second slot and so on, but the highest bidder pays the price bid by the second-highest bidder, the second-highest pays the price bid by the third-highest, and so on.
The auctioneer does not disclose the current maximum bid, but the second highest bid is always public. In proxy bidding, the wise bidder must know in advance the "true" value of an item as a basis for their secret bidding limit. [2] The fact that the maximum bid is revealed when it is outbid introduces the possibility of maximum bid fishing.
One of the most popular online auctions to buy cars from is eBay Motors. [13] On eBay Motors, any user can create an account and put their vehicle(s) up for auction even if they are from a state that only allows closed auctions. There is usually a fee associated with selling a vehicle on eBay. [14]
Items are allocated based on bid order; the highest bidder selects their item(s) first followed by the second highest bidder, etc. In a modification, all of the winning participants pay only the last announced price for the items that they bid on. [1] The Dutch auction is named for its best known example, the Dutch tulip auctions.
Proxy bidding is an implementation of an English second-price auction used on eBay, in which the winning bidder pays the price of the second-highest bid plus a defined increment. It differs from a Vickrey auction in that bids are not sealed ; the "current highest bid" (defined as second-highest bid plus bid increment) is always displayed.
On eBay, you’ll find tons of winter boots in all different styles and sizes — many of them for less than $20 or $30. That’s a great deal if you don’t need to wear them that often, or if ...
In France, when the last bid has been made in an auction for an art object, a representative of the state can say "Préemption de l'état" ("Pre-emption of the state") and buy the object for the highest bid. [4] Some housing cooperatives similarly allow members of the cooperative to pre-empt any buyer of a house constructed by the cooperative. [5]
Online auctions often use an equivalent version of Vickrey's second-price auction wherein bidders provide proxy bids for items. A proxy bid is an amount an individual values some item at. The online auction house will bid up the price of the item until the proxy bid for the winner is at the top.