by Alexander Moschina, Investment U Research Wednesday, May 18, 2011 For independent sellers, competing with the likes of Amazon.com (Nasdaq: AMZN) and Barnes & Noble (NYSE: BKS) in the e-book market was already difficult. But now Apple (Nasdaq: AAPL) is making it even harder… The company recently changed its app policy so that e-book sellers [...] (AMZN) Apple Grows Dominance of eReader Monopoly