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cost per action being the second popular method of compensation and the least popular methods today are cost per click and cost per mille. Cost per click and cost per mille are used in display advertising and for paid search. Cost per mille only requires that the advertiser makes the ad available on his web site Cost per click requires an additional step. In this the customer should not only see the ad but should click on it and visit the advertiser's site. In the cost per sale method the affiliate has to do more than refer a customer to a publisher only after a customer makes a purchase through referrals by an affiliate does the affiliate gets paid.