An ascending price auction where the bid price keeps increasing starting from a reserve price till no bidder can match the highest standing bid.
A descending price auction which begins with a high asking price which decreases until one bidder is willing to pay the quoted price
A sealed bid first price auction, where bidders submit sealed bids and the highest bidder wins and pays his bid.
An sealed bid second price auction where bidders submit sealed bids and the highest bidder wins and pays the amount of the second highest bid.
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