So says the Yankee Group:
Falling prices and new business models will help U.S. e-book unit sales to grow from an estimated $313 million in 2009 to $2.7 billion in 2013, according to a new Yankee Group forecast. The research firm predicts that e-book downloads will outpace those of paid mobile apps during the period, growing at an annual rate of 83% compared to 72%. …
New e-book formats — such as platforms from Vook and Sideways that enable authors to embed audio and video into their text — will provide additional incentives for people to make the switch from print …
More info in this article in MediaPost News.
Thanks to Michael von Glahn for the link.