Joel E. Cohen

http://www.demographic-research.org/volumes/vol18/14/

doi:10.4054/DemRes.2008.18.14

	Click the icon to view and/or download the PDF file. Once you are in the PDF file, use your browser back button to return to this page.

Abstract
To understand better a possible future constant global population that is demographically heterogeneous, this paper analyzes several models. Classical theory of stationary populations generally fails to apply. However, if constant global population size P(global) is the sum of all country population sizes, and if constant global annual number of births B(global) is the sum of the annual number of births of all countries, and if constant global life expectancy at birth e(global) is the population-weighted mean of the life expectancy at birth of all countries, then B(global) x e(global) always exceeds P(global) unless all countries have the same life expectancy at birth.

Author's affiliation
Joel E. Cohen
Rockefeller University, United States of America

Keywords
average age, Cauchy-Schwarz inequality, constant population, heterogeneity, life expectancy, migration, pensions, population projection, stationary population, zero population growth

Word count (Main text)
6107

Other articles by the same author/authors (in Demographic Research)

[22-5] Life expectancy is the death-weighted average of the reciprocal of the survival-specific force of mortality

Similar articles in Demographic Research

	[21-29] Survival as a Function of Life Expectancy (stationary population, life expectancy)
	[14-7] The relative tail of longevity and the mean remaining lifetime (life expectancy, heterogeneity)
	[7-8] Life Expectancy at Current Rates vs. Current Conditions: A Reflexion Stimulated by Bongaarts and Feeney’s "How Long Do We Live?" (life expectancy, heterogeneity)

[ Back to previous page ]