The difference between unified cashier and independent cashier

One is the unified cashier in the store, and the other is the merchant's own cashier. From the earliest entry into the department store market to the early home stores, it is basically the practice of merchants registering themselves. Over time, self-checkout has also become the practice of renting a home store. Now, in addition to low-end home stores and small commodities department stores, more and more stores are moving towards a unified cashier. One is the unified cashier in the store, and the other is the merchant's own cashier. The contradiction between the two does not seem as "earth-shattering" as "store rent", but in fact, under the seemingly calm game, it is also undercurrent.