title: Bidding process in online auctions and winning strategy: Rate equation approach.
abstract: Online auctions have expanded rapidly over the last decade and have become a fascinating new type of business or commercial transaction in this digital era. Here we introduce a master equation for the bidding process that takes place in online auctions. We find that the number of distinct bidders who bid k times up to the tth bidding progresses, called the k-frequent bidder, seems to scale as n(k)(t) approximately tk(-2.4). The successfully transmitted bidding rate by the k-frequent bidder is likely to scale as q(k)(t) approximately k(-1.4), independent of t for large t. This theoretical prediction is close to empirical data. These results imply that bidding at the last moment is a rational and effective strategy to win in an eBay auction.
authors.affiliation: School of Physics and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: I
authors.initials: I
authors.lastname: Yang
authors.forename: B
authors.initials: B
authors.lastname: Kahng