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Sure, it's an estimate just like all percentages of the market (pretty much any market) are estimates. The difference is they know how much they sold. They look at the various estimates on how many ebooks are sold, and go from there. Actually, I suspect that the ebook's sold figures are pretty solid. Remember, authors are paid based on ebooks sold, so there is at least a paper trail (or electronic trail as the case may be) backing up the check they get. Interview enough authors and you get a pretty good idea. I would think that it's more likely to be correct than not.
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