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Agencies at two rival holding companies have become partners in a new company, Commonwealth, formed to work on Chevrolet's global account. Omnicom’s Goodby, Silverstein & Partners, San Francisco, and Interpublic’s McCann Erickson Worldwide, N.Y., have signed on to the 50/50 joint venture after a creative review to consolidate the global business for the General Motors brand.
In the review launched last autumn, GM roster shops Omnicom, Interpublic, Publicis Groupe and Cheil Worldwide put forth proposals to the auto marketer.

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