The English auction is the format most people picture when they hear “auction” — an open, ascending-price sale where bidders compete by raising bids until no one bids higher. The auctioneer announces each bid, calls for the next, and drops the hammer when bidding stops.
The English auction is the dominant format for live auctions worldwide and the basis for nearly all online auction software. Variations include open-outcry (live, in-room), telephone bidding, and online ascending-price. Its strengths: it surfaces the buyer’s true willingness-to-pay through competitive bidding, and the process feels fair because all bids are visible to all participants.
Game-theory analysis of the English auction shows that under standard assumptions, bidders rationally bid up to (but not above) their personal valuation, so the lot sells at the second-highest bidder’s valuation plus one bid increment. This makes English auctions efficient at extracting value: the lot goes to whoever values it most, and the price reflects what the marginal underbidder was willing to pay. The auction’s social energy — visible competition, public commitment — also tends to push bidders past their pre-stated maximums, which is why live auctions often outperform timed online auctions on identical lots.