Engel's law
Sign in to saveempirical observation in economics that as income rises, less is spent on food
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income elasticity of demand
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United Nations
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poverty
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International Standard Book Number
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economy
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population density
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digital object identifier
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International Standard Serial Number
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human migration
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income
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world population
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eugenics
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sustainability
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JSTOR
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Green Revolution
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standard of living
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one-child policy
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family planning
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antinatalism
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population growth
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