After a month-long courtship involving multiple merger proposals by global brewing giant AB Inbev (NYSE:BUD) to acquire chief rival SABMiller (NASDAQOTH:SBMRF), the details of the deal were announced on Oct. 12. Both entities have operations in over two dozen countries across five continents, have relationships with carbonated beverage makers like Coca-Cola and Pepsi, and have a stranglehold on the beer industries in multiple countries. It's enough to make one's head spin (especially that of regulators who will have to review the deal). While the merger of these two companies has its plusses, there are numerous pitfalls and negatives. Here's what investors in the beer industry need to know:

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