Cannes Lions

Martin Sorrell Part 4: Rebates, Measurement and Review Mania

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In the final video with WPP CEO Martin Sorrell from Cannes, Mr. Sorrell talks about why there are so many media agency reviews this year and the challenge of measuring return on advertising and marketing investment.

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Watch the previous videos with Mr. Sorrell, in which he discusses his initial interest in Sapient, WPP succession and agencies' frenemy relationships with Google and Facebook.