世界银行分组标准。
“This table classifies all World Bank member economies, and all other economies with populations of more than 30,000. For operational and analytical purposes, economies are divided among income groups according to 2009 gross national income (GNI) per capita, calculated using the World Bank Atlas method. The groups are: low income, $995 or less;lower middle income, $996–3,945; upper middle income, $3,946–12,195; and high income, $12,196 or more. Other analytical groups based on geographic regions are also used.”
pdf网址是 http://www.preventionweb.net/english/hyogo/gar/2011/en/bgdocs/Annexes/GAR%2011%20Annex%201%20World%20Bank%20country%20classification.pdf
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