We often discuss the "value proposition" as a key element of a company's marketing strategy. As consumers we are bombarded with value propositions daily. We decide which propositions appeal to us, and whether to buy or not buy a product. Much of marketing, however, takes place between organizational buyers and sellers (B2B, B2I, B2O). Elaborate on how a seller's value proposition is affected by this seller/buyer context. What are the strategic implications of marketing in this environment?