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From Wikipedia the free encyclopedia, by MultiMedia

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An auctioneer and her assistants scan the crowd for bidders

An auction is the process of buying and selling things by offering them up for bid, taking bids, and then selling the item to the highest bidder. In economic theory an auction is a method for determining the value of a commodity that has an undetermined or variable price. In some cases, there is a minimum or reserve price; if the bidding does not reach the minimum, there is no sale (but the person who puts the item up for auction still owes a fee to the auctioneer). In the context of auctions, a bid is an offered price.

Auctions are publicly seen in several contexts:

• in the antique business, where besides being an opportunity for trade they also serve as social occasions and entertainment
• in the sale of collectibles such as stamps, coins, classic cars, luxury real estate, and fine art
• for the sale of second-hand goods of all kinds, particularly house clearances and online auctions
• in thoroughbred horseracing, where yearling horses are commonly auctioned off; and
• in legal contexts where forced auctions occur, as when one's farm or house is sold at auction on the courthouse steps.

Although less publicly visible, the most economically important auctions are those in which the bidders are businesses or corporations. Examples of this type of auction include:

• sales of businesses
• spectrum auctions, in which companies purchase licenses to use portions of the electromagnetic spectrum for communications (for cell phone networks, for example)
• timber auctions, in which companies purchase licenses to log on government land
• electricity auctions, in which large-scale generators and consumers of electricity bid on generating contracts
• environmental auctions, in which companies bid for licenses to avoid being required to decrease their environmental impact
• debt auctions, in which governments sell debt instruments, such as bonds, to investors. The auction is usually sealed and the uniform price paid by the investors is typically the best non-winning bid. In most cases, investors can also place so called non-competitive bids which indicates an interest to purchase the debt instrument at the resulting price, whatever it may be.

The world's three largest auction houses are Christie's, Sotheby's and Bonhams. Internet auctions have become very popular; the world's largest auction site is eBay.

Auction catalogs are frequently printed and distributed before auctions of rare and/or collectible items; these catalogs may be very elaborate works, with considerable details about the items being auctioned.

Auctioneers are usually trained in the legal and practical aspects of conducting auctions. Some jurisdictions require auctioneers to be licensed and bonded. In the U.S., auctioneers who have completed Auctioneer School commonly use the title Colonel and are given this honorary title because in the U.S. Civil War, Colonels of the armies were called upon to auction off the spoils of war.

Types of auctions

Tuna auction at the Tsukiji fish market in Tokyo

• English auction: This is what most people think of as an auction. Participants bid openly against one another, with each bid being higher than the previous bid. The auction ends when no participant is willing to bid further, or when a pre-determined "buy-out" price is reached, at which point the highest bidder pays the price. The seller may set a 'reserve' price and if the auctioneer fails to raise a bid higher than this reserve the sale may not go ahead.

• Dutch auction: In the traditional Dutch auction the auctioneer begins with a high asking price which is lowered until some participant is willing to accept the auctioneer's price, or a predetermined minimum price is reached. That participant pays the last announced price. This type of auction is convenient when it is important to auction goods quickly, since a sale never requires more than one bid. The Dutch auction is named for its best known example, the Dutch tulip auctions; in the Netherlands this type of auction is actually known as a "Chinese auction". "Dutch auction" is also sometimes used to describe online auctions where several identical goods are sold simultaneously to an equal number of high bidders. Economists call the latter auction a multi-unit English ascending auction.

• Sealed first-price auction: Also known as Sealed High-Bid Auction or First-Price Sealed-Bid Auction (FPSB). In this type of auction all bidders simultaneously submit bids so that no bidder knows the bid of any other participant. The highest bidder pays the price they submitted.

• Sealed second-price auction, also known as a Vickrey auction: This is identical to the sealed first-price auction, except the winning bidder pays the second highest bid rather than their own. In theory, this is mathematically equivalent to the English auction, because in both the first-place bidder receives the item at a price equal to the second-place bidder's willingness to pay, plus the bid increment. True strategic equivalence requires a modified model of the English ascending auction in which the price rises continuously with bidders choosing when to drop out. When all but one bidder drops out, the good is allocated to the remaining bidder at the price at which the second-to-last bidder dropped out. Implemented as such, this is known as a Japanese Auction.

• Silent auction: This is a sealed variant often used in charity events, but involving the simultaneous sale of multiple items. Participants submit bids normally on paper, near the item. They may or may not know how many other people are bidding or what their bids are. The highest bidder pays the price they submitted.

• Procurement auction: This kind of auction reverses the roles of seller and buyer. The buyer puts out an RFQ for a given commodity and providers offer progressively lower prices in hopes of getting the business. At the end of the auction, the lowest bid wins.

• Digital art auction: In this indefinitely long auction, designed for unreleased works that are trivially reproducible at zero cost (recordings, software, drug formulae), bidders openly submit their maximum bids (which may be adjusted or withdrawn at any time). The seller may review the bids and close with a price of their choosing at any time
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