There are indicators: quality quantification is related to price quantification, and consumers can buy with confidence! to promote sales

No index: it is mysterious, easy to raise prices and has a large profit margin. . . .

bad

There are indicators: the profit margin is small, which is easy to form bad competition among businesses.

No index: consumers are prone to doubt when buying, and it is easy to encourage shoddy and deceive merchants! Moreover, in this case, businessmen who generally fool will have an advantage, but the relationship with the quality of goods will be reduced!