The algorithm determines which paid ads are shown at the top of the organic search results.
http://adwords.blogspot.com/2007/08/...placement.html
Quote:
The key change to the formula will be how we consider price. Today’s formula considers an ad’s Quality Score and actual cost-per-click (CPC). The improved formula will still heavily weight Quality Score, but instead of actual CPC, it will consider an ad’s maximum CPC. Here’s why:
Actual CPC is determined, in part, by the bidding behavior of the advertisers below you. This means that your ad’s chance of being promoted to a top spot could be constrained by a factor you cannot influence. By considering your ad’s maximum CPC, a value you set, you will have more control over achieving top ad placement.
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This will happen in the next few weeks.