An auction is the process of buying and selling goods by offering them up for bid, taking bids, and then selling the item to the winning bidder. In economic theory, an auction is a method for determining the value of a commodity that has an undetermined or variable price.

Auctioning can be traced as far back as 500 B.C. Auctions can be with reserve or minimum, or without minimums, or absolute or no reserve. In reserve auctions, there is a minimum bid 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 may still owe a fee to the auctioneer or auction company). In absolute or no reserve auctions, the sale is guaranteed, with only the price left to be determined. In the context of auctions, a bid is an offered price.

History of the Auction

According to ancient Greek scribes, the more generally accepted auction occurred first in Babylon in 500 B.C. During this period, auctions were held annually, and women were sold on the condition of marriage. It was considered illegal to allow a daughter to be sold outside the auction method. Women with “beauty” engendered higher bidding, women without “beauty” had to pay a dowry to be accepted into the auction, and thus the price would be negative.

During the Roman Empire, following military victory, Roman soldiers would often spear the ground to mark the location of spoils in which goods and property were seized. Roman business agents were said to have accompanied warriors into battle to help facilitate expected sales. The Romans also used the auction to liquidate their own property. For example, Marcus Aurelius is said to have auctioned off prized heirlooms and furniture, (an auction that, as legend has it, lasted over two months). The most legendary auction occurred in the year 193 A.D. when the entire Roman Empire was put on the auction block by the Praetorian Guard. On March 23rd, The Praetorian Guard first killed Pertinax the emperor, and then announced that the highest bidder could claim the entire Empire. Didius Julianus outbid everyone for the price of 6,250 drachmas per Guard, an act that initiated a brief civil war. Didius was then beheaded two months later when Septimus Severus conquered Rome.

During the 17^th century, soon after the French Revolution, auctions came to be held in taverns and coffeehouses to sell art. Such auctions were held daily, and catalogs were printed to announce available items. Such Auction catalogs are frequently printed and distributed before auctions of rare or collectible items. Many of these catalogs may be very elaborate works themselves, with considerable details about the items being auctioned.

During the American civil war, goods seized by armies were sold at auction by the Colonel of the division. Thus, some of today's auctioneers in the U.S. carry the unofficial title of "colonel". Auctioneers are usually trained in the legal and practical aspects of conducting auctions. Some jurisdictions require auctioneers to be licensed and bonded.

Major auction houses include Christie's, Sotheby's, Lyon & Turnbull, and Bonhams. The Dorotheum, the world's oldest auction house, was established in 1707 in Austria.

Internet auctions, such as eBay and GoIndustry, have become very popular with the prevalence of Internet. Other websites, such as AuctionZip and Auctioneers, display live auction listings from auctioneers nationwide.

Types of auctions

Primary types of auctions

Within this type of auction, there is several manners in which bidding can occur. First, is the absolute auction, which means that the item will be sold for the highest possible price, with no reserve. Second, is a reserve auction, which establishes a minimum bid or price for the item that will be accepted by the person who is selling the item. Third, you have Absentee bidding, which means that a bid is left with the auctioneer. Fourth, is internet bidding, where the bidding can be online and at the auction house at the same time. Fifth is Phone bids, which is nearly identical as absentee bidding, but a auction house employee does the bidding for the buyer. And last but not least is the sealed bidding process.

All of the private value auctions listed above are revenue equivalent when under complete information scheme, meaning that they all result in the same expected revenue for a seller.

Other auction terminology

In terms of security/privacy, there are two main types of auctions:

In terms of auctioneers and auction items, we can differentiate three types of auctions:

If more than one identical item is sold, there are two possible generalizations of the second-price auction. In a uniform-price auction, all of the winning bidders pay the price submitted by the highest non-winning bidder. Bidders will not typically bid their true value in a uniform-price auction with multiple units. In a Vickrey (or second-price sealed-bid) auction, the pricing rule is more complicated, but preserves the property that bidders will bid their true valuation. It is also possible to auction each identical item individually. Once each item has been priced, the winning bidder is entitled to buy the remaining goods at the same price. Items the winning bidder opts not to purchase are auctioned again. This system creates a tension between the desire to hold back on bidding since later items will almost certainly be cheaper, and the chance that by losing the first round of bidding all possibility of purchasing will be lost.