Quote:
Smarter and Smarter Pricing
With the new AdWords pricing model, weÂ’ll also automatically adjust the price of clicks across the Google Network based on their expected value to the advertiser. A number of factors will be taken into account when calculating the expected value, including the keywords or concepts that triggered the ad. For example, a click on an ad for digital cameras on a web page about photography tips may be worth less than a click on the same ad appearing next to a review of digital cameras.
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I really doubt Google has reliable technology here. Just seems to be random devaluing of clicks.