Over at TPV, the Authors Earnings Data Guy observed:
Quote:
This graph measures dollars spent, not books purchased.
In unit sales terms, these dollar figures mean that more ebooks are being bought than (new) print books.
Mousing over the Economist chart for 2014 yields:
– $9.99 billion in print sales
– $5.69 billion in ebook sales
But keep in mind:
The average ebook purchase is $5.55 (or $7.42 if you leave out indies)
The average (new) print book purchase from BookScan’s Top-100 was $15.42
Make of that what you will 
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http://www.thepassivevoice.com/10/20...comment-258627
What *I* make of it is that more ebook editions are being sold than pbook and audio editions combined. A total of a billion or so, give or take...
(Just check the fine print at the Economist--they rolled Audio Book sales in with pbook sales.)
Those numbers also lead to some "interesting" comparisions for authors.