1. Cosmetic plastic surgery industry: The reason why the customer unit price is high but the gross profit is low is that the cosmetic plastic surgery service needs to invest expensive equipment and technology, and the requirements for professionals are high. The cost paid by each customer is high, but due to factors such as material cost, labor cost and other operating expenses, the Mao Lijiao actually obtained in the end is low.

2. Glasses industry: Glasses fitting is a service involving optical knowledge and technology. Each pair of glasses can have a higher price, but the investment required for manufacturing, debugging and after-sales service also increases the cost accordingly. In order to remain competitive in the highly competitive market, it is necessary to reduce product pricing or provide promotional activities, which further affects the gross profit margin.

3. Automobile industry: Automobile maintenance requires complex and specialized tools, equipment and experienced technicians to operate. Especially, more and more advanced electronic systems are used in modern cars, which makes the maintenance more difficult and the cost more obvious. The unit price of automobile maintenance service customers is high, but the gross profit margin is low due to the cost of parts, labor and market competition.