For merchants, they have done several things without credit. Even if the merchants don't do it in the future, everyone will suspect that the merchants have done something bad.
Take several small businesses downstairs of my home as an example. There are two fruit stalls and three small shops. The owner of a store always raises the price of a product by 50 cents for no reason, such as a drink he often drinks. 3 yuan, another supermarket, is 3.5 yuan when he comes. Although there is not much money, don't treat customers as fools. After two inexplicable price increases, he generally won't go to this small shop. The other two small shops close early, so I can't go to this store to buy a pack of 5 yuan things. I felt cheated at that time. This boss has always been greedy and cheap. He must be very expensive. However, when I went to other small shops the next day, it was really 5 yuan. This is the result that merchants always want to cheat consumers because they don't talk about credibility. In the future, everyone can't believe the price and promise given by the merchants.
There is also a vendor who gives you small favors in the open and sells bad things to you in the dark. Consumers have long been tired of such tricks, so they must be honest if they want to run a good business.