Abstract: With the quick development of the Internet, the traditional economic actions are appearing on the Internet. Based on the traditional auction theory and combined with IT technology, online auctions have become a unique payoff mode of e-commerce. This paper focuses on three different buyout price rules on different auction sites: the fixed buyout price, the temporary buyout price and the permanent buyout price. The optimization of the seller’s revenue is one of the auction theory’s core issues. This paper starts from seller’s revenue of three different buyout price auctions and analyzes the result under the independent private valuation model and come to the conclusion.

Key words: onlineauction, buyoutprice, seller’srevenue