What are the realistic economic indicators brought by reservoir resettlement?

1, ordinary immigrants have brought rich and cheap labor, which has played a great role in some infrastructure construction, such as the former Chinese workers in history.

2. The migration of high-tech talents has greatly promoted the development and progress of science and technology, which in turn provides impetus for economic development.

3. Immigrants of different races have also brought diverse cultures, and these diversified economies have also promoted more or less.