[Kindle and Sony Reader owners read more] Amazon […] says that people with Kindles now buy 3.1 times as many books as they did before owning the device. That factor is up from 2.7 in December 2008. So a reader who had previously bought eight books from Amazon would now purchase, on average, 24.8 books, a rise from 21.6 books. “You are going to see very significant industry growth rates as a result of the convenience of this kind of reading,” said Jeffrey P. Bezos, chief executive of Amazon. Sony, maker of the Reader family of devices, says that its e-book customers, on average, download about eight books a month from its online library. That is far more than the approximately 6.7 books than the average American book buyer purchased for the entire year in 2008, according to Bowker, a publishing industry tracking firm.
November 4, 2009