“Another problem is Amazon’s market dominance. The firm accounts for less than a quarter of physical book sales. But Amazon sells 60-70% of e-books in America and perhaps 90% in Britain… In America, Barnes & Noble’s Nook is the main competitor. Surprisingly, given the success of the iPad, Apple’s iBookstore has lagged… Only half of iPad owners read e-books—and two-thirds of them own or plan to buy an e-reader especially for the purpose.”