Abstract: A comparison between items for sale in a marketplace and items for sale at an external retailer is used to generate one or more recommended actions for the marketplace. For example, if the marketplace has a comparable quantity of available items in a product cluster with better prices, a recommendation to promote the items based on price may be generated As another example, if the marketplace has a better variety of items available in the product cluster, a recommendation to promote the items that are unavailable at the external retailer may be generated. As a third example, if the marketplace has fewer items available in the product cluster, a recommendation to procure additional inventory may be generated. As yet another example, if the marketplace has items available in the product cluster at a higher price than the external retailer, a recommendation to reduce prices may be generated.