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Defying the third-party firms that sell themselves to customers amid claims of greater incidents of click fraud, as much as 20 or 30 percent, a Google executive claimed the actual rate is only about 2 percent.

Companies in the business of protecting clients against illicit clicks may have to answer a dicey question from those prospective customers: "If click fraud is only two percent, why do I need you?" Google Says Click Fraud Only 2 Percent