The rich man bought 8 hairy crabs weighing 2.5 taels online. After receiving the goods, he found that each hairy crab was less than 1.5 taels. He tried to argue with the merchant, but the merchant ignored him at all. So he went to the market and bought 12 hairy crabs weighing 4 taels. I took a picture of the hairy crabs with my mobile phone and posted them in the comments, saying that the merchant’s hairy crabs were big and good, each weighing more than four taels, and they gave away four more crabs. A week later, the seller’s store was reported to have deceived consumers because other buyers Everyone complained and returned the goods. He said that the hairy crabs he received were far inferior to his, and they were also given as gifts. This story comes from the opposite approach in game theory. There was a rich man who liked to be clean. He had a big yard at home, and the neighbor's children often came to play. He couldn't drive him away and was very irritated. The rich man thought of a way. He told the child that every time he came to play, he would reward you with a dollar. After a week, the dollar turned into 50 cents, and the 50 cents turned into 2 cents. In the end, he simply refused to give it. The children were angry and said they wanted us to come here to play even if we didn't pay. From then on, the children never came again. This story comes from the art of flattery and killing in game theory.

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