Do you know google make its 97% revenue from online marketing ads.This earning gain by Google through CPC (cost per click) on Online ads.The amount that an advertiser pays to Google if a search user clicks on an ad once.
WordStream, an online marketing company, analyzed the most expensive keyword categories for online advertising and found that keywords related to Insurance, Loans, Mortgage, Attorneys and Credit were the most expensive with advertising costs ranging between $55-$45 per click.
There is list of most expensive keyword in adword in which some are paid upto $55 in certain categories.

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