1. Birth rate: The number of births per 1,000 people in a population is a major determinant of population growth. Higher birth rates lead to population increase, while lower birth rates can result in population decline.
2. Death rate: The number of deaths per 1,000 people in a population also plays a significant role in determining population size. Higher death rates can lead to population decline, while lower death rates can result in population growth.
3. Migration: Migration, both internal (within a country) and international, can have a significant impact on population size. In-migration can increase population size, while out-migration can decrease it.
4. Fertility rate: The average number of children born to a woman during her reproductive years is a key factor in determining population growth. Higher fertility rates lead to population increase, while lower fertility rates can result in population decline.
5. Life expectancy: The average number of years a person is expected to live can also impact population size. Higher life expectancy can lead to population growth, while lower life expectancy can result in population decline.
6. Economic factors: Economic conditions, such as employment opportunities, income levels, and access to healthcare, can influence population growth. Higher economic development is often associated with lower birth rates and higher life expectancy.
7. Social and cultural factors: Social and cultural norms, beliefs, and practices can also influence population size. For example, attitudes towards family size, gender roles, and marriage can impact fertility rates.
8. Government policies: Government policies, such as family planning programs, immigration policies, and healthcare initiatives, can also play a role in shaping population size. For example, policies that promote access to contraception and education for women can lead to lower fertility rates.