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 sale of eBooks continue to rise quickly, many wonder what impact they will have on the sale of printed books. The market sizes listed here are for print books, pBooks if you will, and do not include eBook or audiobook sales.

Geographic reference: United States
Year: 2003 and 2009
Market size: $22.2 billion and $23.4 billion respectively
Source: Association of American Publishers, 2009 S1 Report, February 2010, page 2 available online here.
Original source: AAP and Management Practice