This is really a special and good concept in “Google AdWords/AdSense”.
What is this Google smart pricing about?
Through this, Google eliminates the invalid clicks from the ads displayed through AdWords Campaign. (Repeated clicks from a single IP - an example for invalid click).

Google will not tell the secret on how they find the invalid clicks.

But this greatly helps the advertiser to save their money from the illegal and invalid clicks.

Through Google AdWords you can get good ROI :)

This topic is discussed in detail at Google Smart Pricing.

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