Recent innovations in e-commerce have led to the emergence of online retailing platforms. where millions of products are sold. Most of these products are sold by third-party sellers who pay a fee for the e-retailer (called the platform owner). We investigate how the e-retailer manages the various products in the presence of consumer heterogeneity and diseconomies of scope. https://hollandscountryclothinges.shop/product-category/protective-eyewear/