Disclosed are various embodiments for identifying clusters of user accounts who have similar purchase histories and generating product assignments for products identified in the purchase histories. The clusters of user accounts may depict an affinity towards a first type of product while depicting an aversion to a second type of product. The first type of product and the second type of product may have one or more opposing attributes. Product assignments for the products may be generated based on attributes of the products, product categories associated with the products, or the clusters.