An auction during which the bidder who submitted the very best bid is awarded the item being sold and pays a worth equal to the number bid. Alternately, in a very procurement auction, the winner is that the bidder who submits all-time low bid, and is paid an quantity equal to his or her bid. In apply, first-price auctions are either sealed-bid, during which bidders submit bids simultaneously, or Dutch. Alternately, second worth auctions conjointly award the item to the very best bidder, however the payment is equal to the second-highest bid. Not like second worth auctions, during which bidding one's true worth may be a dominant strategy, in first-price auctions, bidders shade their bids below their true worth.