Sometimes a price drop can be too good to true and that is where sales rank comes into play. As you are sourcing online for deals from sites like Keepa.com or CamelCamelCamel, it is extremely important to always remember the demand side of selling.
In the world of economics, when a price drops (all other things being equal) the quantity demanded increases. The same can be true with the price drops that occur on Amazon or other ecommerce sites. In order to prevent bad purchases, we take a look at the sales rank of a product to see the demand over time. This gives us a view into the performance of a product and how likely it is to sell in the future at a higher price.
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