Why yahoo is copying the same Adsense program of Google?

Question: http://publisher.yahoo.com/

Answers:
Because it works! It makes money for both Yahoo or Google, and the website publishers.

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Actually, if you'd followed this story for long enough, you'd find out that Overture, a company Yahoo! bought a couple of years ago, actually came up with the Adsense style of advertising first, and google had to pay Yahoo!/Overture in order to use the relevant patents.

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