Seattle-area law firm Hagens Berman on Tuesday filed a class action lawsuit accusing Apple of colluding with publishers to fix iBookstore prices. The suit, submitted in a Northern District of California court by representing members Anthony Petru and Marcus Mathis, accuses Apple of making unfair deals with Hachette, HarperCollins, Macmillan, Penguin, and Simon & Schuster to artificially keep prices high. In adopting the agency pricing model, where the store takes a fixed cut but lets publishers dictate the price, Apple set terms that forced Amazon to abandon the who