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Two universal pathways in demographic transition.

¹Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Aramaki aza Aoba 6-3, Aoba-ku, Sendai, Japan.

Evolutionary Human Sciences

|July 14, 2026

Summary

Global demographic transition shows two universal pathways linked to modernization. These phases, characterized by distinct fertility and mortality patterns, are explained by a new theoretical model.

Keywords:

Global data reveal two universal pathways linking fertility and longevity countries demographic transition fertility decline follow or switch between them global data analysis

Related Experiment Videos

Area of Science:

Demography
Sociology
Economics

Background:

Demographic transition, marked by falling fertility and mortality, is a global phenomenon linked to modernization.
Existing models of fertility decline are primarily based on Western countries, leaving applicability and mechanisms in other regions unclear.

Purpose of the Study:

To identify universal pathways and underlying mechanisms of demographic transition across diverse global regions.
To analyze changes in crude birth rate (λ) and life expectancy (e₀) from 1800-2020.

Main Methods:

Utilized global data from 237 countries and territories spanning 1800-2020.
Identified two distinct pathways governing demographic trajectories (Phase I and Phase II).
Developed a theoretical model based on the trade-off between reproduction and education to explain phase transitions.

Main Results:

Two universal pathways (Phase I: conserving λe₀; Phase II: conserving λexp(e₀/17)) were identified, governing most countries' demographic trajectories.
Phase I (pre-1950) was characterized by high child mortality and steady population growth.
Phase II (post-1950) is marked by low child mortality, steady GDP per capita growth, and is accelerated by factors like declining educational costs and Westernization.

Conclusions:

Demonstrates quantitative regularities in fertility and longevity during demographic transition.
Provides a theoretical framework for understanding the mechanisms driving demographic shifts globally.
Highlights the role of modernization, education, and social factors in accelerating the transition to Phase II.