Concept
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Stratification
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Global Stratification Indicators - Inequality and Income
Globally, the poorest 20% of the population, or lowest tier of the stratified economic order, makes a disproportionately small percentage of global income and lives off of a meager amount.
Source
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"Poorestquintilebysurvivingondollar."
http://commons.wikimedia.org/wiki/File:Poorestquintilebysurvivingondollar.jpg
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