Taking coffee maker Keurig Green Mountain Inc (GMCR.O) private will give JAB Holding Co an opportunity to press for higher margins and even increase prices for the single-serve K-Cups used in about 21 million U.S. homes, analysts and industry bankers said. JAB said on Monday it would buy Keurig for $13.9 billion, its biggest acquisition in a quest to build a global coffee powerhouse to better compete with Switzerland’s Nestle SA (NESN.VX).