by the BBC
Amazon has announced that in the US it sold more e-books for its Kindle device than it sold paperback books in the last three months of 2010. But its profit margins were down as it spent money on discounting, acquisitions and building new depots. Amazon shares fell 9% in after-hours trading as its sales were not as good as had been expected.
http://www.bbc.co.uk/news/business-12305015
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