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What Amazon Sales Ranks Mean - Estimating How Many Books Sold by Amazon: "sales rankings could be approximated with a log scale. Using publicly available numbers for Amazon's actual sales, we were able to assign numbers to that matched the shape of the curve to actual numbers of books sold. Due to the dynamic nature of the top selling books, the lack of data points available to me for plotting blockbusters, the shape of the top end of the curve is drawn as a distribution. "

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