What advantages and disadvantages will the increase of immigrant population bring to a country?

The advantage is that it can increase the vitality of the economy to a certain extent, alleviate the shortage of labor, and the immigration of outstanding talents will also improve the overall strength of the country.

The disadvantage is that it will occupy certain resources and space, occupy the domestic job market and social welfare, and raise prices. This disadvantage is not obvious when the economic situation is good. Once the economic situation is bad, regional protection will rise and xenophobia will appear. The control of local household registration in China is a kind of regional protection.