1. New population = population base * population growth rate. Asia's population growth rate is not as high as Africa's, but it still contributes the largest number of new people globally based on its large population base.

2. The relationship between population growth and GDP per capita growth is not positive, and global GDP per capita is mainly affected by the economies of developed countries when they experience economic crises. For example, the European sovereign debt crisis in 2011 and the US subprime mortgage crisis in 2008 could quickly spread to the whole world and lead to a severe decline in GDP per capita.

3. Developed countries have high GDP and low or no population growth rate. Developing countries have a high population growth rate and low GDP----a severe imbalance in the distribution of wealth per capita.

4. The global GDP share is skewed towards developed countries with high GDP but shows zero or even negative population growth. Therefore, to ensure economic development, developed countries tend to encourage immigration to absorb foreign population to promote the development of service industry and transfer low output value industries to developing countries and underdeveloped countries, which exacerbates the imbalance of GDP among countries.

5. Population aging and regional imbalance in population structure are important trends in world population. Therefore, there is a need to encourage the development of the retirement economy and encourage population mobility to develop the economy.