What is the best way to explain marketing?

A Professor was explaining marketing concepts to the MBA Students:
1. You see a gorgeous girl at a party. You go up to her and say: “I am very rich. Marry me!” - That’s Direct Marketing
2. You’re at a party with a bunch of friends and see a gorgeous girl. One of your friends goes up to her and pointing at you says: “He’s very rich. Marry him.” - That’s advertising
3. You see a gorgeous girl at a party. You go up to her and get her telephone number. The next day, you call and say: “Hi, I’m very rich. Marry me.” - That’s Telemarketing
4. You’re at a party and see gorgeous girl. You get up and straighten your tie, you walk up to her and pour her a drink, you open the door of the car for her, pick up her bag after she drops it, offer her ride and then say: “By the way, I’m rich. Will you marry me?” - That’s Public Relations
5. You’re at a party and see gorgeous girl. She walks up to you and says: “You are very rich! Can you marry me?” - That’s Brand Recognition
6. You see a gorgeous girl at a party. You go up to her and say: “I am very rich. Marry me!” She gives you a nice hard slap on your face. - That’s Customer Feedback
7. You see a gorgeous girl at a party. You go up to her and say: “I am very rich. Marry me!” And she introduces you to her husband. - That’s demand and supply gap
8. You see a gorgeous girl at a party. You go up to her and before you say anything, another person come and tell her: “I’m rich. Will you marry me?” and she goes with him - That’s competition eating into your market share
9. You see a gorgeous girl at a party. You go up to her and before you say: “I’m rich, Marry me!” your wife arrives. - That’s restriction for entering new markets