Jason Epstein writes that the publishing transition from print to digital is inevitable, and a powerful yet fragile process that can expand literacy and knowledge. "The transition within the book publishing industry from physical inventory stored in a warehouse and trucked to retailers to digital files stored in cyberspace and delivered almost anywhere on earth as quickly and cheaply as e-mail is now underway and irreversible. This historic shift will radically transform worldwide book publishing, the cultures it affects and on which it depends. Meanwhile, for quite different reasons, the genteel book business that I joined more than a half-century ago is already on edge, suffering from a gambler's unbreakable addiction to risky, seasonal best sellers, many of which don't recoup their costs, and the simultaneous deterioration of backlist, the vital annuity on which book publishers had in better days relied for year-to-year stability through bad times and good. The crisis of confidence reflects these intersecting shocks, an overspecialized marketplace dominated by high-risk ephemera and a technological shift orders of magnitude greater than the momentous evolution from monkish scriptoria to movable type launched in Gutenberg's German city of Mainz six centuries ago."