Popularity Recommendation Key

[gatelessgate]

How does Target determine the order of products to show in a product recommendation placement when using "Popularity" as the recommendation key? I am using 2 weeks of mbox purchase behavior. Also, do the products get re-ordered and shown randomly on subsequent page visits where the same placement is located? 

[Eric_Vidana · Accepted solution]

Popularity will increment based on product page views. A product page view happens when a Target call is made with specific mbox params. The main param is entity.id which is the ID of the product.