The law is just a document. He needs someone to enforce it. It involves too many aspects, such as the use of books, the waste of food, the overuse of private cars and so on. These are all economy class. The problem of private cars can be reduced by law, but such things as notebooks and meals can be clearly stipulated in the law, but it is too difficult to implement. Because it is impossible for everyone to be supervised whether the paper he uses is reasonable or not and whether the food is wasted. Therefore, it is better to save this matter with education.