Amazon’s sales rank algorithm is surprisingly simple…
Original article written by John Doppler of Selfpublishingadvice.org – link provided below.
1. Each sale or download of a product counts as one point toward a hypothetical “rank score”.
2. Each day, the preceding day’s score decreases by half, and is added to today’s points.
3. For each category on Amazon, books are ranked based on their current scores.
Monday, a book sells 32 copies. That’s 32 points towards its ranking.
Tuesday, the book sells 36 copies. Those 36 points are added to half of Monday’s total (32 / 2 = 16 points), for a total of 52 points.
Wednesday, the book sells 16 copies. Those 16 points are added to half of Tuesday’s total (52 / 2 = 26 points), for a total of 42 points.
…but the devil is in the details.
The underlying process is simple, but there are…
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