Best movie about sales, marketing and advertising

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I have observed that most students today are tired of watching training books and videos. That's why I'm thinking, as part of the requirements for our Marketing Class, that maybe my students could watch a movie. I wanted my students to review a specific movie that relates to our class and at the same time provide an account of the students personal response. But, which is the best movie about sales, marketing, and business that they can really learned more effectively?