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This week SABMiller, the world's second largest beer company, agreed to a $104 billion merger with the globe's top brewer, Anheuser-Busch InBev. If regulators approve the deal, it will be not only the biggest beer acquisition ever, but one of the top five mergers in history. The new super brewer will boast unparalleled dominance in nearly every market on earth, including ownership of 15 out of the 20 top-selling beer brands in the U.S. Still, part of the reason the deal happened is that mass-produced beer sales have gone flat, and the merger could drive even more beer fans into the arms of the underdog craft segment.