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・ Demofonte
・ Demofonte (Berezovsky)
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・ Demofoonte (Mysliveček) (1769)
・ Demofoonte (Mysliveček) (1775)
・ Demogoblin
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・ Demographic analysis
・ Demographic and Health Surveys
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・ Demographic dividend
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Demographic gift
・ Demographic gravitation
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・ Demographic history of Bačka
・ Demographic history of Belgrade
・ Demographic history of Bosnia and Herzegovina
・ Demographic history of Croatian Baranja
・ Demographic history of Detroit
・ Demographic history of Greece
・ Demographic history of Japan before Meiji Restoration
・ Demographic history of Jerusalem
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・ Demographic history of Kosovo
・ Demographic history of Macedonia
・ Demographic history of modern Greece


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Demographic gift : ウィキペディア英語版
Demographic gift
Demographic gift is a term in used to describe the initially favorable effect of falling fertility rates on the age dependency ratio, the fraction of children and aged as compared to that of the working population.
==Overview==
Fertility declines in a population combined with falls in mortality rates—the so-called "demographic transition"—produce a typical sequence of effects on age structures. The child-dependency ratio (the ratio of children to those who support them) at first rises somewhat due to more children surviving, then falls sharply as average family size decreases. Later, the overall population ages rapidly, as currently seen in many developed and rapidly developing nations. Between these two periods is a long interval of favorable age distributions, known as the "demographic gift," with low and falling total dependency ratios (including both children and aged persons).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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