Jefferies analyst Brian Tanquilut says that while Walgreens Boots Alliance (WBA) acquiring AmerisourceBergen (ABC) would be accretive to earnings, it would be a "headscratcher" for investors. The companies already have a joint venture that affords both the strategic value that combining would provide, Tanquilut tells investors in a research note after the Wall Street Journal reported that Walgreens approached AmerisourceBergen a few weeks ago. The analyst has a Buy rating on Walgreens with a $93 price target. He adds that the potential deal would allow Walgreens to further expand its U.S. business.