Eating is expensive. Official website information of Dafeng Zoo shows that Dafeng Zoo is located in Dafeng District, Nantong City, Jiangsu Province, and there are relatively few catering resources around it. Therefore, businesses providing catering services in zoos can use their monopoly position to raise food prices. The catering service providers in the zoo need to pay a certain rent, and also need to buy raw materials, equipment, wages and so on. These are all costs, and merchants need to cover these costs through the sales price.