Dianna Dilworth reported on Russ Grandinetti's presentation at Digital Book World today. From
Ken Follett’s Kindle Sales Dropped 48% After $2 Price Increase On Book:
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the week the publisher switched from the $7.99 Amazon price on the title to the $9.99 publisher determined price, Kindle sales of the book dropped by 48%.
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This would be more convincing if longer term sales trends were used.
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Kindle owners buy 3.3x as many books in the year after purchasing a Kindle than in the year prior
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This is presumably only purchases at Amazon. It certainly demonstrates that ebooks are good business for Amazon.
The full report isn't very long, and it is worth reading.