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Google stresses their minimum 0.5% CTR ratio in order to keep listings relevant. If your fall below this ratio, your listings are removed and you are asked to change the ad copy until you can achieve this ratio. Secondly, your CTR ratio in combination with the max per click rate you set will determine where you rank among the competition. This model makes it different than Overture's model and since Overture's model is patented, a way for Google to not have to pay Overture (pending a lawsuit going on right now...). An interesting approach in my opinion, but I believe the 0.5% CTR is too high since these listings are rather small and shoved into the right side of the screen. I don't like Google for that since its too annoying if some listings go offline in the middle of a campaign because of the CTR ratio.
WG
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I play with Google.
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