The findings, which are based on the results of an index compiled by WARC, and based on the Effie Awards results, are drawn from 40 worldwide Effie competitions. (In case you didn't get it, Effies are named for campaign effectiveness.)
The most effective independent shop, not affiliated with one of the major agency holding companies, is Portland-based Wieden & Kennedy.
Full results can be found at www.effieindex.com, but in case you're interested in how the top five rank, here they are for advertiser, brand and holding company.
Advertisers: Procter & Gamble Unilever Kraft Nestle Coca-Cola.
Brands McDonald's Pepsi Coca-Cola Chevrolet Vodafone
Holding Cos. Omnicom WPP IPG Publicis Havas