UPDATE 3-Ad giant WPP pulls dividend, buyback and outlook as clients cut spending
* Shares rise as group cuts costs* WPP to cut 2 bln stg of spending* Organic growth fell 16% in China (Adds reaction, context)By Kate HoltonLONDON, March 31 (Reuters) - The world's biggest advertising company WPP has pulled its dividend and share b...
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