What will the Omnicom and Interpublic merger mean for the Mad Men?

It might have been a scene out of the TV drama Mad Men. Last weekend, John Wren and Philippe Krakowsky, the bosses of America’s two biggest advertising agency holding companies, secretly met in the wood-panelled offices of the Manhattan law firm Latham & Watkins to finalise the terms of a $31 billion (£24.6 billion) tie-up that would shake up the global advertising market.

Wren, the wily chief executive of Omnicom, and Krakowsky, the cerebral boss of Interpublic, have been talking for a year about a deal to create the world’s biggest agency group, in the face of financial and technological pressures on the agency sector.

For Wren, who has been in the top job at Omnicom since 1997, this is his second attempt at

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