Sir Martin Sorrell admits reason for 'September cliff' at WPP, Interpublic Group, Publicis Group & Omnicom is 'difficult to explain'

by Maud Largeaud , AdForum

The reason for the sharp slowdown recorded by the big four global marketing companies; WPP, Omnicom, Interpublic Group (IPG) and Publicis is ‘very difficult’ to explain, WPP’s CEO Sir Martin Sorrell has admitted

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