Retailers like Walmart put significant effort into designing where a particular item goes in the store and how many of them. They use their own internal invento

Retailers like Walmart put significant effort into designing where a particular item goes in the store and how many of them. They use their own internal inventory statistics and whatever other creepy information they can get to decide what items go at eye level, or near the entrance or exit, how many on a shelf, etc. It probably works quite well. Amazon is scraping up all the effort that Walmart spent researching market demand in a given location.