Amazon.com seems to have had a problem with their sales ranking system for kindle books. My book, among many others, has lost its sales ranking, and accordingly also seems to have lost its place in Amazon's recommendation system. With the reduced recommendations from the Amazon system, my book's place in the "most popular" list for space opera went from 37th to 103rd and falling.
Amazon claims they are working on the problem, but I suspect that lost sales rank will not be returned, and when the system is fixed, the books that lost their rank will be re-ranked much, much lower. Very frustrating.
I guess this shows that when a single vendor (Amazon) has this much dominance, they can mess things up even with no ill-will on their part. I have no reason to believe that Amazon is doing anything wrong here, and I suspect they are working on the problem as fast as they can, but the result is the same from my end; my book's sales just fell off the edge of the Earth.
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