According to The New York Times:

In the United States and Britain, sales of e-books represent between a quarter and a third of the consumer book market and, by 2018, will edge out printed and audio books as the most lucrative segment, according to projections by the consulting firm PricewaterhouseCoopers.

As Nate Hoffelder of The Digital Reader points out though, the “perennial ebook optimists” at PricewaterhouseCoopers have now moved that goalpost back two years running. In 2012 they predicted that eBook sales would outpace print by 2016. In 2013, they said it’d happen in 2017. Now… it’s 2018.

One thing is certain, though: for many years to come, authors in the United Sates and Britian will need to make their books available in both print and digital editions in order to reach the most readers.

It’s also interesting to see how much less a share of the marketplace eBooks hold in many European countries. It’s exciting to see the growth opportunity for digital books in that region, but also a great chance for authors to continue selling print books to the millions of English-speakers in countries like Germany, Sweden, Norway, etc.

From Chris Robley of bookbaby