After general industrial and agricultural products are produced, most of them have to go through multiple circulation links before they can reach consumers. If the products fail to pass the quality inspection before leaving the factory, they can be reworked. In the store, the products you think are not satisfied can be ignored, but the catering products are different. Its production, sales and consumption are almost synchronous, so the producer and consumer are face-to-face service and face-to-face consumption.