Max Nisen, Columnist

Pfizer's Murky Post-Allergan Path

Its other options, including straight M&A, have drawbacks, too, though.
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Underestimate Fightin' Jack Lew and his Treasury Department at your peril.

Pfizer and Allergan have been acting as if their $160 billion merger was a sure thing, despite the fact that the deal -- designed in part to net Pfizer a lower Irish tax rate -- pretty clearly stuck in the craw of the Obama administration.