Because the country has discovered that after training institutions enter education, education has become a zero-sum game. The training institution is like an open sunflower collection. If you practice, you have to be in the palace, but if you don't practice, others may destroy you if you practice. In the end, everyone will be in the palace, but no one has become a master of martial arts. The same is true for training institutions. When you go to college, you have to go from the palace to your childhood. If you don't go to college, you may lose the opportunity to go to college. In the end, everyone will go to college, but the total number of places to go to college has not increased. It's just that everyone's childhood is gone. So, this is a typical zero-sum game.

There are actually such examples abroad. In the 1950s, the Ivy League football schools in the United States increased their training in order to improve their performance, but it was found that at the end of the season, the rankings of the teams were similar to before, because everyone was increasing their training, and the gap between each other did not widen. Increasing training has affected students' learning. In the end, everyone thought of a way to limit spring training to one day. In this way, there were a lot of mistakes in the game, but because it is not a professional league, the audience's requirements are not high. On the contrary, because of less skills, the competition is more intense, and the competition is more violent.The students didn't waste much time either.

The country's introduction of this double reduction actually has this meaning, but the question is, who can guarantee that students will listen to the country and not go to make-up classes? If you don't want institutions to make up for it, you can ask for private education, or parents can teach by themselves. In the end, I returned to the zero-sum game, and the cost of the game was even higher. It is said that the offer for make-up classes from a famous teacher in Haidian, Beijing is two million.

And there is another example in the market where a blessing in disguise avoids a zero-sum game, which is tobacco. In the past, tobacco used to advertise in order to promote it. Their goal in advertising was to win customers from competitors and not to let their customers be taken away. Therefore, the total number of customers has not increased, but the tobacco companies have increased their advertising costs a lot. Finally, the state introduced a ban on tobacco advertising. At first, everyone felt dissatisfied, but after they found that everyone stopped advertising, the total number of customers did not decrease. On the contrary, everyone spent a lot less on advertising, but their profits increased.

Therefore, how to make this double reduction come into practice, we have to think of more ways and study more game theory.

 Our life is to choose again and again. We can use the knowledge of game theory to help us optimize our choices, which is a huge advantage in accumulation.