Study Of Human Population — Demography: The

: Birth rates begin to fall as society urbanizes and education (especially for women) increases.

: 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. Demography: The Study of Human Population

: 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

: High birth and death rates; population size remains stable but low. Demographers measure this through the Total Fertility Rate

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.