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Is AJ partially using results from overture and combining with it's own program?
What you might be seeing is AskJeeves picking up some of Yahoo's results, which DOES have an overture relationship (they own overture now).
Default PPC listings come from Google AdWords.
Advertisers can set up an AJ advertising account and their ads can be shown above the Google AdWords backfill, if their bids meet the minimum cpc limit determined by AJ. This price varies per keyword.
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