http://quod.lib.umich.edu/cgi/t/text...36451.0013.101
From the article..
Quote:
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Perhaps the most significant finding of this study was the contrasting results received by Tor and the other three groups studied. With one exception, sales of the nonfiction titles increased after a free digital release, and when the sales of the books were combined, sales were up 5%. The majority of the fantasy/science fiction books that were not part of a group release also had increased sales, and as a group their sales increased 26%, largely as a result of “Title 12.” Four of the five Random House books saw sales gains after the free versions were released; in total, combined sales of those five books increased 9%. These three groups were in contrast to our initial hypothesis that book sales would decline. Although we cannot say that the free e-books caused sales to increase, a correlation exists between a free e-book and increased print sales.
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It looks like the only losers were tor who seem to use a different setup for how to download and how long they're available