Volume 38 - Article 54 | Pages 1635–1662

Non-zero trajectories for long-run net migration assumptions in global population projection models

By Guy J. Abel

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Date received:31 Oct 2016
Date published:16 May 2018
Word count:6745
Keywords:migration, population projections
DOI:10.4054/DemRes.2018.38.54
 

Abstract

Background: Little attention is given to the role of migration in global population projection models. Most demographers set future levels of net migration on trajectories towards zero in all countries, nullifying the impact of migration on long-run projected populations. Yet as fertility and mortality rates fall, the role of migration on future population change is becoming more pronounced.

Objective: In this paper we develop future long-run migration scenarios to provide a range of possible outcomes.

Methods: Our alternative migration scenarios are linked to the Shared Socioeconomic Pathways (SSP), widely used in research on global environmental change. These are utilized as inputs for a global cohort component projection model to obtain population totals up until 2100 for all countries.

Contribution: The results illustrate the important role of migration assumptions in long run projections, especially in post demographic transition countries. Further, they provide plausible alternatives to projections based on the commonly used, but poorly justified, convergence to the zero net migration assumption.

Author's Affiliation

Guy J. Abel - Asian Demographic Research Institute, China [Email]

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» Integrating uncertainty in time series population forecasts: An illustration using a simple projection model
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» Estimating global migration flow tables using place of birth data
Volume 28 - Article 18

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