There is a village. In the village everybody is very rich. They are rich because they do well in business. One day a young man came to the village and met with a businessman. "Look!" he said, "people here are very rich. All of you are good at business. What is the secret?" "The secret is that we eat a lot of fish. And the fish is good for our brains. It makes us clever." answered the businessman. "Oh, I see," said the young man, "Please tell me what the name of the fish is." "I don't know," said the businessman, "But if you give me $10, I can send you some." The young man thought that was a good idea. So he gave $10 to the businessman and left his address. Soon the young man received a box with three fish. One month later, the young man met that businessman again. "Thank you for the fish," he said, "But listen! $10 for only three fish is too expensive." "Oh, you see!" said the businessman. "The fish is beginning to have an effect on you. You are becoming clever."