If you want to sell a product to a large company like Walmart, you can’t just walk in the door of its corporate headquarters and demand to see a purchasing agent. You will first have to get past of a number of gatekeepers, or people who will decide if and when you get access to members of the buying center. These are people such as buying assistants, personal assistants, and other individuals who have some say about which sellers are able to get a foot in the door.
Gatekeepers often need to be courted as hard as prospective buyers do. They generally have a lot of information about what’s going on behind the scenes and a certain amount of informal power. If they like you, you’re in a good position as a seller. If they don’t, your job is going to be much harder. In the case of textbook sales, the gatekeepers are often faculty secretaries. They know in advance which instructors will be teaching which courses and the types of books they will need. It is not uncommon for faculty secretaries to screen the calls of textbook sales representatives.