Pfizer-Allergan Merge in Largest Inversion Deal

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Pfizer and Allergan are merging to create the world’s biggest drug company, worth $155 billion. The deal — which will move corporate headquarters to Ireland — is the biggest so-called "inversion" ever. An "inversion" is a way to avoid paying US taxes. Jonathan Rockoff, who covers the pharmaceutical industry for the Wall Street Journal, has the details.