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In economics, geography and demography the dependency ratio is an age-population ratio of those typically not in the labor force (the ''dependent'' part) and those typically in the labor force (the ''productive'' part). It is used to measure the pressure on productive population. ==Formula== In published international statistics, the dependent part usually includes those under the age of 15 and over the age of 64.The productive part makes up the population in between, ages 15 – 64. It is normally expressed as a percentage: : As the ratio increases there may be an increased burden on the productive part of the population to maintain the upbringing and pensions of the economically dependent. This results in direct impacts on financial expenditures on things like social security, as well as many indirect consequences. The (total) dependency ratio can be decomposed into the child dependency ratio and the aged dependency ratio:〔(Association of Public Health Epidemiologists in Ontario )〕 : :〔 == World Bank 2010 Age dependency ratio by country == As of 2010, Japan and Europe had high aged dependency ratios compared to other parts of the world.〔http://data.worldbank.org/indicator/SP.POP.DPND.OL/countries?display=map〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dependency ratio」の詳細全文を読む スポンサード リンク
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