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Internet search engines and comparison shopping have recently begun implementing a paid placement strategy, where some content providers are given prominent positioning in return for a placement fee. This bias generates placement revenues but creates a disutility to users, thus reducing user-based revenues.
Hemant K. Bhargava
Juan Feng
From the WWW2002 Conference.
Paid Placement Strategies for Internet Search Engines [www2002.org]
Here's an article that was posted last month
Insights Into Developing Paid Placement Strategies for the Internet [newswise.com]