Shopping in large shopping malls and shops is a unified checkout. Why don't the shops charge themselves?

The checkout method of large shopping malls is determined by the cooperation contract between the two parties. There are two general checkout methods: collecting money by yourself and unified checkout in shopping malls. The cooperation mode of collecting money by oneself is generally pure rent, and shopping malls have no assessment of performance and no requirements for report data. However, although some of them collect money by themselves, they still follow the shopping mall system, but consumers are confused. General shopping mall unified checkout is the sales-related drawings and assessment agreed by both parties, and enterprises need this data and process. There is little difference between these two methods for consumers, and after-sales may be more beneficial to consumers.