The answer is b2b (business to business) markets. In this type of market, a market manager is more likely to be given accountability for a particular market segment. All customers such as these (retail, wholesale, and so forth) in a specific industry comprise what’s called a vertical market, and the managers of these markets are called vertical market managers. B2B companies organize in this way because buying needs and processes are probably to be similar within an industry and channels of communication are likely to be the same within an industry but different across industries.