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Interpublic Group of Cos.' stock hit $80.62 Dec. 29, a 52-week high that gave New York-based Interpublic an $11 billion stock market valuation. It capped a share price gain of more than $30 since the October stock market slide, when Interpublic stock traded in the high $40s. General Motors Corp. last month said it will shift regional dealer ads to its national shops next year, generating substantial new business for Interpublic agencies (AA, Dec. 21). In trading Dec.
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