Check out this great post from Chris McMullen’s blog on How Amazon.com Sales Rank works.
AMAZON.COM SALES RANK
Amazon assigns a sales rank to every product that has sold at least one time.
The lower the number, the better the product is selling.
For example, a sales rank of 2500 is better than a sales rank of 375,000.
The product that sells the best in its category has a sales rank of 1.
Amazon has different ranks for different types of products.
Books are ranked independently from sports equipment and video games, for example.
For a given type of product, there are also category ranks.
For example, a few Books categories include Romance, Children’s, and Science.
A great overall rank is more impressive than a category rank.
For example, a book has to sell quite frequently to rank 500 overall in Books, but can sell much less frequently and still rank 500 in Romance.
A good rank in a broad category is more…
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