How to develop rural areas in the future?

Relying on the primary industry, in rural areas, you may not be able to support a few people, otherwise how can so many migrant workers go to work in cities? In order to develop the secondary industry, in rural areas, competition can't compete with cities, and it is impossible to join the competition regardless of limited human and financial resources and various resources. Developing the tertiary industry seems to be the only way to build a new countryside. In the future rural development, we can consider building a service-oriented new countryside based on cities. The fifties and sixties were the peak of China's fertility. After ten years, everyone born in that era will be old. The crowded space, polluted air and tense rhythm in the city will more and more seriously affect the living environment of the elderly. The rural wilderness, fresh air and fresh vegetables all create a good place for the urban elderly to return to the countryside and nature. Can we consider establishing a community in rural areas to provide services for the elderly in cities? To do this, first, open up more space for migrant workers to work in cities; Second, reduce the burden of urban family life; Third, provide employment opportunities for rural left-behind people; Fourth, promote a virtuous circle of the economy. Throughout history, without immigrants, it is impossible for a region to take off economically. Because there are no immigrants, there is no economic activity. It goes without saying that the United States is the largest immigrant country and the largest power in the world. Hong Kong is an immigrant city, and its economic take-off is obvious to all. Shanghai is an immigrant city, leading the country in economy and technology. The most obvious is Shenzhen, which has changed from a small fishing village to a metropolis in just 30 years. Attracting the elderly to the countryside is equivalent to immigration. With popularity and providing services for them, there will be economic activities and opportunities to fundamentally change the backward situation in rural areas. Relying only on national policies and national investment will eventually be weak.