Implementing Sponsored Search in Web Search Engines: Computational Evaluation of Alternative Mechanisms
Informs Journal on Computing, Forthcoming
25 Pages Posted: 16 May 2005
Abstract
The practice of sponsored search advertising - where advertisers pay a fee to appear alongside particularWeb search results - is now one of the largest and fastest growing source of revenue for Web search engines. We model and compare several mechanisms for allocating sponsored slots, including stylized versions of those used by Overture and Google, the two biggest brokers of sponsored search. The performance of these mechanisms depends on the degree of correlation between providers' willingness to pay and their relevance to the search term. Ranking providers based on the product of relevance and bid price performs well and is robust across varying degrees of correlation. Ranking purely based on bid price fares nearly as well when bids and relevance are positively correlated (the expected regime), and is further enhanced by adding an editorial filter. Regardless of the allocation mechanism, sponsored search revenues are lower when users' attention decays quickly at lower ranks, emphasizing the need to develop better user interfaces and control features. The search engine can address initial inscience of relevance scores by modifying rank allocations over time as it observes clickthroughs at each rank. We propose a rank-revision strategy that weights clicks on lower ranked items more than clicks on higher ranked items. This method is shown to converge to the optimal (maximum revenue) ordering faster and more consistently than other methods.
Keywords: Internet search engines, preferential placement, sponsored search, slot allocation
Suggested Citation: Suggested Citation
Do you have a job opening that you would like to promote on SSRN?
Recommended Papers
-
Position Auctions with Consumer Search
By Susan Athey and Glenn Ellison
-
Paid Placement: Advertising and Search on the Internet
By Yongmin Chen and Chuan He
-
An Empirical Analysis of Search Engine Advertising: Sponsored Search in Electronic Markets
By Anindya Ghose and Sha Yang
-
By Sha Yang and Anindya Ghose
-
From Generic to Branded: A Model of Spillover Dynamics in Paid Search Advertising
-
Search Engine Advertising: Channel Substitution when Pricing Ads to Context
By Avi Goldfarb and Catherine E. Tucker
-
A Dynamic Model of Sponsored Search Advertising
By Song Yao and Carl F. Mela
-
Ex Ante Information and the Design of Keyword Auctions
By De Liu, Jianqing Chen, ...