E-book customers have filed a lawsuit against Amazon, claiming that the company has been violating antitrust laws by illegally colluding with five major publishing houses to inflate e-book prices. Amazon had allegedly entered anticompetitive pricing arrangements with Hachette, HarperCollins, Macmillan, Penguin Random House, and Simon & Schuster. The arrangements allowed the publishing houses to artificially inflate prices by 30%. The lawsuit claims that Amazon has used its market dominance to charge consumers more.