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europeforvisitors - 12:34 am on Jun 6, 2007 (gmt 0)
Google isn't offering PPA for contextual advertising, and PPA isn't a practical substitute for for smart pricing, quality-based pricing, or--better yet--quality-based ad placement.
Google is getting things right via pay per action. Smart pricing is not a good way to lure potentially new advertisers, pay per action is the way.