Few people eat at the end of the month. At the end of the month, the salary is the lowest, and there are fewer people eating at the end of the month. Less orders mean fewer people eat at the end of the month. Catering industry is a food production and operation industry that provides consumers with all kinds of drinks, food, consumption places and facilities through instant processing, commercial sales and service labor. According to the definition of European and American standard industrial classification, catering industry is a catering service organization.