Automated purchasing of television and radio ads could be moving closer to reality through a testing effort led by Interpublic Group, which has signed up A+E Networks, Cablevision, Clear Channel and Tribune Co. for the effort. Interpublic says the system could be operational in as little as six months, both on the buying and selling side. Data "cannot be restricted to digital media," says Matt Seiler, CEO of IPG Mediabrands.

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