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Inside Amazon’s rankings

Amazon updates its rankings of book sales every day, but the conversion from the Amazon rank to the actual level of sales is a closely guarded secret. Didier Sornette and colleagues at the Institute of geophysics and planetary physics at UCLA have recently carried out a detailed study of rankings on the website. They estimate that the book ranked ten in sales on sells about 100 a day and rank number 100 around 30 a day. But sales fall away rapidly, with rank 1,000 selling some ten a day and rank 10,000 just two.


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