Why did Shanghai move its manufacturing industry out for the sake of popular science?

It is considered that Shanghai is not a resource city, and there are not many ordinary workers in Shanghai (the development direction of Shanghai is a dream city dominated by finance), so it is required to transform into a high-tech service industry, which restricts many manufacturing industries.

Large shipbuilding industry and power equipment are still operating in Shanghai, but most of the manufacturing has been scattered to other provinces and cities or employees in other provinces and cities are working.