WPP Chief Says Ad Markets Improving

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Markets have improved across regions though, with the biggest turnaround in the U.S., where organic revenue growth has accelerated, Sir Martin said. The recovery in Western Europe is still slower though and is likely to remain slow for a while, he added.

There are some clouds on the horizon... people are starting to be nervous again," he said, adding however that there are no signs yet that such new fears are impacting WPP's business. "The caution is a good thing though because when there's caution, people do something about it."

Last month, WPP acquired the entire issued share capital of Midia Digital and I-Cherry, two digital agencies in Brazil, specializing in digital marketing and search marketing respectively. "We'll continue to do such things," he said.