What should the old man do if he insists on paying 500 yuan when he goes out to set up a stall for divination?

This situation can be solved by clearly informing the rules, understanding the needs and adhering to the principle of good faith.

1. Clearly inform the rules: explain the charging standards and service contents to the elderly. Usually, if the price is lower than that in 500 yuan, we should stick to our own price system, and can't change it at will just because the other party's bid is high.

2. Understand the needs: ask the elderly why they are willing to pay a high price, whether they have any special needs or troubles, and ensure that they can provide services with corresponding value.

Adhere to the principle of good faith: If you think you can't provide him with the value or help that matches 500 yuan's, you should politely refuse and tell him that you want to provide fair service to everyone at a reasonable price.