What is Smart Pricing in Google AdSense and how to avoid it
Smart Pricing is Google’s attempt to protect advertisers through their Google AdWords program which will automatically lower the CPC (Cost per Click) of an AdSense ad if Google think the publisher gives low conversion rate for the Google AdWords advertisers. This means that if an AdWords advertiser bids $1 on a keyword, you as an AdSense publisher might get a lot less than that $1 per click.
If you think you are earning too little per clicks, you might be smart-priced too. You may want to review the following suggestions to fix this situation.