This is an estimate of the auction that you could set to allow your ad on the first page of search results. Source & more infos : http://topadsense.info/adsense-ad-auction/ (If you find it helpfull and informative, Like and share ) This estimation assesses the approximate maximum cost per click (CPC) would be required to set to allow your ad on the first page when a search query exactly matches your keyword. If your bid does not match this estimate, your ad may still be released, but probably not on the first page of search results. This estimate is based on the quality of the keyword associated with the auction and the number of advertisers competing for that keyword. If an estimate of first page bid is very high, it may mean that the quality of the keyword is low and must be improved. To view the bid estimates first page of your keywords, see the column “Estim. First page bid†your keyword table. This estimate is not a guarantee. Even if you match with your bid estimate First page bid, it is possible that your ad is still not appearing on the first page. Use this estimate to help you make decisions (on auction) informed and tailored to your needs. [video=youtube;1vWp2-QMOz0]http://www.youtube.com/watch?v=1vWp2-QMOz0[/video]