That's the same thing I linked to two posts up.
Anyhow, you're right that the ebook sales haven't altered the paper book sales over the last 10 years.
What's interesting is whether the overall market will get smaller (piracy), stay the same, or grow due to ebook sales taking off. My bet goes on the latter, as anecdotal evidence suggests that the ease of using ebooks, and the convenience of buying them (and reading straight away) on line, increases the number purchased.
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