" The world?s leading search engine Google, seeking to revamp its Google Adsense programme is currently testing a new online-ad system in which advertisers pay only when their ad leads to a purchase.

The new cost-per-action system will be a separate ad auction system from the current cost-per-click setup. AdSense publishers will be able to choose from a selection of ads and will have more flexibility in promoting the ads. Since they?ll be tied to a purchase, the new ads are expected to be auctioned at higher prices than cost-per-click ads, which cost advertisers every time an ad is clicked on whether or not it leads to a sale. The ads also would cut down on click fraud, which occurs when ads are clicked on without there being any intention of making a purchase... more
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