Q: Why, why, why?
A: http://www.un.org/en/development/desa/population/publications/ageing/replacement-migration.shtml
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Replacement Migration: Is It a Solution to Declining and Ageing Populations?
United Nations projections indicate that over the next 50 years, the populations of virtually all countries of Europe as well as Japan will face population decline and population ageing. The new challenges of declining and ageing populations will require comprehensive reassessments of many established policies and programmes, including those relating to international migration.
Focusing on these two striking and critical population trends, the report considers replacement migration for eight low-fertility countries (France, Germany, Italy, Japan, Republic of Korea, Russian Federation, United Kingdom and United States) and two regions (Europe and the European Union). Replacement migration refers to the international migration that a country would need to offset population decline and population ageing resulting from low fertility and mortality rates.
Download:
Press Release
English (HTML) French (HTML) German (PDF) Japanese (PDF) Russian (PDF) Spanish (HTML)
Report
Cover, Preface and Note
Executive Summary (PDF): English - French - German - Russian
Chapter 1 - Overview of the issues
Chapter 2 - Literature review
Chapter 3 - The Approach: Methodology and Assumptions
Chapter 4 - Results
A. Overview
B. Country Results
France
Germany
Italy
Japan
Republic of Korea
Russian Federation
United Kingdom of Great Britain and Northern Ireland
United States of America
Europe
European Union
Chapter 5 - Conclusions and Implications
References
except the UN has yet to explain WHY ageing or shrinking populations NEED to be replaced. Why can’t they just happily shrink, to expand at some future time?