After working in fashion e-commerce for years I've come to the conclusion that in e-commerce we do not sell clothes... we sell images of clothes. Compressed, digital versions of physical products. As Roland Barthes pointed out in The Fashion System, a product image is a symbol or metaphor of a product. Media--in this case images--mediates ... See more
Market-making is certainly a characteristic of Aggregators; Google, for example, is a one-stop shop for users, advertisers, and content suppliers. What makes Aggregators unique, though, is their infinite scalability, driven by the effectively zero marginal and transactional costs necessary to serve one more user, advertiser, or supplier.