Allergan Plc. signage is displayed on the exterior of the company’s office in Medford, Massachusetts, U.S. (Photographer: Scott Eisen/Bloomberg  )

Abbvie Drops by a Record as Allergan Deal Fails to End Doubts

(Bloomberg) -- AbbVie Inc. agreed to pay $63 billion for rival drugmaker Allergan Plc, the latest merger in an industry where some of the biggest companies have been willing to pay a big premium to...

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