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PPC - Pay Per Click.
Pay for Performance - You pay only when a client order product or service.
Am I right?
But, On Yahoo! Product Submit Center
(http://productsubmit.adcentral.yahoo.com/sspi/us/index2)
It says:
Pay for Performance -Inclusion in Yahoo! Product Search and buyer’s guide pages is based on a cost-per-click price that varies by product category. You pay only for leads directly to your site.