An old man is running a fruit stand and displays a sign that reads 1 melon for $3, 3 melons for $10. A young man approaches and asks for one melon, for which he pays $3. He proceeds to purchase a second, and then a third, each for $3. As the young man walks away he calls out, “Hey old man, I just bought 3 melons for $9. Maybe you’re not so good at this business thing.” The old man mutters to himself, “Almost everyone who comes to my stand buys 3 melons instead of 1, but they all want to teach me how to do business”.