Population stability is when the number of births equals the number of deaths, resulting in a stable population size over time. For a stable population, the replacement fertility rate must be met. This means each woman needs to have enough children to replace both her and her partner in the population, typically calculated as 2.1 children per woman in many regions.
Various factors affect population stability, including:
- Infant mortality rates
- Life expectancy
- Migration patterns
When mortality rates are high, more births are required to maintain population size, as seen with increased infant mortality. Ensuring population stability requires a delicate balance of social, economic, and health policies to address these factors effectively.