The Pfizer Inc. company logo is seen on packaging for Viagra tablets, produced by Pfizer Inc., in this arranged photograph taken in London, U.K. (Photographer: Chris Ratcliffe/Bloomberg)  

Pfizer’s $11 Billion Cancer-Drug Deal Takes Pricey Path to Growth

(Bloomberg Opinion) -- Pfizer Inc. is demonstrating once again how expensive it is for pharma firms to buy their way to growth.

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