Video on msnbc.com: In an SEC Filing, Valeant Pharmaceuticals said it expected to offer a mix of stock and about $15 billion in cash for botox maker A (more)

Video on msnbc.com: In an SEC Filing, Valeant Pharmaceuticals said it expected to offer a mix of stock and about $15 billion in cash for botox maker Allergan. David Krempa, Morningstar equity analyst, and CNBC's Meg Tirrell, provide perspective.

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