: Death rates fall due to better sanitation and medicine, while birth rates remain high, leading to rapid population growth.
: The actual reproductive performance of a population. Demographers measure this through the Total Fertility Rate (TFR) —the average number of children a woman would have in her lifetime. Currently, the world is nearing the "replacement level" of 2.1, below which a population eventually begins to shrink.
: Birth rates begin to fall as society urbanizes and education (especially for women) increases. Demography: The Study of Human Population
: 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.
: High birth and death rates; population size remains stable but low. : Death rates fall due to better sanitation
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
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. Currently, the world is nearing the "replacement level" of 2
: 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.