Authors call on FTC to investigate Amazon’s alleged monopoly in the bookselling industry - The Verge

In the letter, the Authors Guild, American Booksellers Association, and Open Markets Institute urge the FTC to look into Amazon's "monopoly in its role as a seller of books to the public." The three organizations accuse Amazon of dominating "almost every aspect of the book market," citing data that the company sells over 50 percent of all physical books in the retail market, 90 percent of physical books sold online, and over 80 percent of all ebooks on the market.