: Both rates are low; the population stabilizes.
Demography is the scientific study of human populations, primarily focusing on their size, composition, and spatial distribution, as well as the dynamic processes that drive change—, mortality , and migration . It is a multidisciplinary field, drawing on statistics, sociology, economics, and biology to analyze how individual life events shape global and local trends. The Core Pillars of Demography
: The incidence of death in a population. Improvements in healthcare and nutrition have led to a significant increase in global life expectancy, which rose by over eight years between 1995 and 2026. Demography: The Study of Human Population
: Birth rates fall below death rates, leading to an aging and potentially shrinking population—a stage now characterizing many advanced economies like Japan and Italy.
: Death rates fall due to better sanitation and medicine, while birth rates remain high, leading to rapid population growth. : Both rates are low; the population stabilizes
The structure and evolution of any population are determined by three fundamental variables:
: Birth rates begin to fall as society urbanizes and education (especially for women) increases. The Core Pillars of Demography : The incidence
Most modern demographic analysis is framed by the , which describes the historical shift from high birth and death rates to low ones as societies develop.