When it comes to sales growth rates, completely new products have a vast advantage over mature products. Within the book business, eBooks are the new thing right now. As the publishing world races to keep up with the faster moving high technology world and its eReader offerings, the market for eBooks will likely show continued rapid growth over the next decade.

Geographic reference: United States
Year: 2003 and 2009
Market size: $19.7 million and $313.2 million respectively
Source: Association of American Publishers, 2009 S1 Report, February 2010, page 2 available online here.
Original source: AAP and Management Practice