Such is the explosive growth of the e-book market that Apple, as revealed during the ongoing price-fixing trial brought by the US Department of Justice, grew its iBooks business by 100 percent in 2012 alone, and yet that was only enough for it to maintain its place at 20 percent share of the overall market -- suggesting that Amazon also saw a doubling of its e-book business that year as well. Apple has maintained that 20 percent share more or less since it entered the market in 2010.
