An analysis of alternative slot auction designs for sponsored search
EC '06 Proceedings of the 7th ACM conference on Electronic commerce
An adaptive algorithm for selecting profitable keywords for search-based advertising services
EC '06 Proceedings of the 7th ACM conference on Electronic commerce
Dynamics of bidding in a P2P lending service: effects of herding and predicting loan success
Proceedings of the 20th international conference on World wide web
Cyclical Bid Adjustments in Search-Engine Advertising
Management Science
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We present a characterization of empirical price data from sponsored search auctions. We show that simple models drawing bid values independently from a fixed distribution can be tuned to match empirical data on average, but still fail to account for deviations observed in individual auctions. Hypothesizing that these deviations are due to strategic bidding, we define measures of "jamming" behavior and show that actual auctions exhibit significantly more jamming than predicted by such models. Correspondingly, removing the jamming bids from observed auction data yields a much closer fit. We demonstrate that this characterization is a revealing tool for analysis, using model parameter values and measures of jamming to summarize the effects of query modifers on a set of keyword auctions.