This is a great article by a mathematical-minded kindle author about how she thinks the Amazon algorithm works. We agree with her. So far we have only got to level 4 with our best selling book. It is great when you get a personal email form an Amazon worker asking if they can promote your book. Highly recommend you read this.
http://carabristol.com/2014/05/why-some-ebooks-sell-and-others-dont-lessons-from-rt14/
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