One merger proponent, consultant Gary Arlen of Arlen Communications in Bethesda, Md.

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Even worse, according to Barrie James, an industry consultant, no merger or acquisition in the drug industry over the past 30 years has increased the combined firms' market share.

ECONOMIST: Drug mergers

"This merger may be intended to grow the sum of the parts, not reduce it, " says industry consultant Michael Boyd.

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