Because meals in school canteens are mainly open to students and teachers on campus, and low prices ensure that most students and teachers can afford to spend money. If all the meals in the canteen are expensive, then the school canteen will lose the meaning of its establishment.

The people who eat in the school cafeteria are basically students and faculty members inside the university, and all of them live inside the school, and the cafeteria has become the main place for them to eat. Inside the school, most of the students come from ordinary families, except for some of them who are from wealthy families and can spend at any high level. Children from these families need to plan to use their living expenses. There are also a small number of students who come from poor families with financial difficulties and they go to school on student loans. These students usually choose to eat the cheapest set meal inside the dining hall to maintain their basic needs.

The dining hall always has some low-priced packages that have not increased in price for over a decade. These packages are not sold for profit, but to make meals affordable for students. These packages are usually not profitable because the price level is too high. School canteens are subsidized by the government's financial resources, and there are conditions for applying for the subsidies, and the price regulation is strictly controlled. So the canteen meals can not arbitrarily increase prices, must retain part of the low-priced packages, so that everyone can afford to eat, and those who have the means to do so can eat well.

In addition to this, although the meals in the canteen are cheaper, the cost of the dishes will be lower because of the large number of people dining in the canteen. Some of these low-priced packages, in fact, not only do not lose money, but may even make a small profit because of the thin margins. The school will also have their own fixed suppliers, these suppliers provide dish ingredients are relatively low-cost. Dining halls use their own frying masters, food aunts, some of these employees are still the teacher's family, the cost is relatively low. The cost of meals made in this way will also be lower.