Marketers cannot create demand or make people buy things that they don't want or need.
However marketing is designed to persuade, inform, and remind people about the availability, choices, features, and advantages associated with new and existing products/services.
A friend of yours agrees with the following adage, "People don't know what they want, they only want what they know."
Write a one-page paper expressing the extent to which you think marketers shape consumer wants, needs, and must haves.