An investor focused on A. City and B. City. In A. City, he was sitting on the street and rubbing his shoes. The shoeshine first untied the laces of one of his shoes and waited until he paid. It was tied up. This detail made him have to doubt the moral standards of the citizens of the city-someone must have washed his shoes and ran away without paying. In B. City, he took a taxi 5 times, before getting off, 5 The drivers all reminded: sir, please bring your belongings. In the end, he set up the business in B. City, which caused 5,000 people to find jobs, and the tax department of B. City gets hundreds of millions of dollars each year. Taxes-this is the influence of a shoe shiner and several taxi drivers. The text is intended to explain:. ['We each have our own influence.', 'Investors will place more emphasis on the moral standards of residents.', 'Human influence is stable, only careful people can discover.', "Someone's inadvertent behavior affects others' important decisions."]