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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.
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.
In the case of the second-price ruling as in a Vickrey auction, the final price for the winner is based on the second bidder's price. A Proxy bid is a special case of second-price ruling used by eBay, where a predefined increment is added to the second highest bid in response to a yet higher bid.
An English auction is an open-outcry ascending dynamic auction. It proceeds as follows. The auctioneer opens the auction by announcing a suggested opening bid, a starting price, or a reserve for the item on sale. Then the auctioneer accepts increasingly higher bids from the floor and sometimes from other sources, for example online or telephone ...
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.
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English auctions are also known as open outcry or raise prices. [12] In live settings, English auctions are announced by either an auctioneer or by the bidders, and winners pay what they finally bid to receive the object. English auctions are the most common third-party online auction format and are known for their simplicity. [13]
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