Arbitrage

Exploiting market inefficiencies by buying and reselling a commodity for a profit. As it relates to the search market, many thin content sites laced with an "Overture" feed or "AdSense" ads buy traffic from the major search engines and hope to send some percent of that traffic clicking out on a higher priced ad. Shopping search engines generally draw most of their traffic through arbitrage.

See also:

• Wolf-Howl: AdSense Arbitrage: Tips, Tricks & Secrets
• [audio] Jeremy Shoemaker interviews Kris Jones and part 2
• Wikipedia: arbitrage