Fertility, Mortality, and the Demographic Transition

This topic studies the historical patterns of births and deaths and the great transition from high to low rates of both, which reshaped human populations over the past two centuries.

Definition

The historical study of fertility and mortality and of the demographic transition—the shift from high to low birth and death rates that accompanied modernization.

Scope

This topic covers the historical levels and trends of fertility and mortality, the determinants of births and deaths before and during modernization, and the demographic transition from a high-pressure regime of high fertility and mortality to a low-pressure regime of low fertility and mortality. It examines the European fertility decline, theories of why mortality fell, and the associated epidemiologic transition in causes of death. The treatment is descriptive and analytical, surveying scholarly reconstructions and interpretations of these changes.

Core questions

• What determined levels of fertility and mortality before modern times?
• Why and how did mortality begin its long decline?
• Why did fertility fall, and what triggered the European fertility decline?
• How did the causes of death change during the epidemiologic transition?

Key theories

Demographic transition theory

Notestein's framework describing the sequenced movement from high mortality and fertility through declining mortality to eventual low fertility, linking these shifts to modernization and changing social conditions.

The European fertility decline

The Princeton European Fertility Project's finding, led by Coale and Watkins, that fertility declined across Europe within a relatively compressed period and that cultural and linguistic factors mattered alongside economic ones.

The epidemiologic transition

Omran's theory describing the shift in dominant causes of death from infectious diseases and famine toward chronic and degenerative diseases as mortality falls and life expectancy rises.

History

Demographic transition theory was formulated in the 1940s by Frank Notestein and others to describe the population history of industrializing societies. The Princeton European Fertility Project, led by Ansley Coale from the 1960s, tested the theory against detailed European data and complicated its economic assumptions by highlighting cultural diffusion. Abdel Omran's epidemiologic transition theory extended the framework to the changing structure of mortality and causes of death.

Debates

Why did fertility decline?

Scholars debate whether the historical fall in fertility was driven mainly by economic modernization and the changing costs and benefits of children, or by the cultural diffusion of new norms and techniques, a tension highlighted by the Princeton project's findings.

Key figures

• Frank Notestein
• Ansley Coale
• Susan Cotts Watkins
• Abdel Omran
• Massimo Livi-Bacci

Seminal works

• notestein1945
• coalewatkins1986
• omran1971
• livibacci2017

Frequently asked questions

What is the demographic transition?

The demographic transition is the historical movement from a regime of high birth and death rates to one of low birth and death rates. Because mortality typically falls before fertility, the transition usually includes a phase of rapid population growth as births outpace deaths.

What is the epidemiologic transition?

The epidemiologic transition, described by Abdel Omran, is the accompanying change in the leading causes of death—from infectious diseases, famine, and high infant mortality toward chronic and degenerative conditions—as overall mortality declines and life expectancy increases.