Walgreen announced it will buy the remaining 55% of Alliance Boots that it does not already own in a $15 billion cash-and-stock deal. When Walgreen bought a 45% stake in Alliance Boots in 2012 for $6.7 billion, it gained the option to take full control of the British drugstore chain within three years. The Deal correspondent Laura Board breaks down how the new deal revises the companies' original agreement and Walgreen's decision not to do a tax inversion deal, which would move its tax base outside the U.S. As Walgreen stands to gain the largest pharmaceutical distribution network in the world from the deal, Board also reveals what the acquisition could mean for the company going forward.

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