With a small population, it is easier to become a developed country. If the population expands too much, it will lead to many ethnic and political problems. On the contrary, it will be bad. If the population is too large, it will be divided like India. Resources are not unlimited, so not everyone has good medical care, housing, employment, marriage and other conditions, which in itself is less. If the population is large, it will be a social disaster for a country. Referring to the poor people in their rural areas and the old men who can't get married, it's because there are few girls and people everywhere. It is difficult to find a job and farm. What is happiness? Despair!