What concept is exhibited by the following graph? 
Definitions:
Poor
Refers to individuals or communities lacking financial resources and essentials for a minimum standard of living.
Richer
Having a greater amount of wealth, resources, or assets compared to a previous state or compared to other individuals or entities.
Relative and Absolute Terms
Concepts used to compare differences in terms of relationships or ratios (relative) and fixed values or units (absolute).
Social Security
A government system that provides monetary assistance to people with an inadequate or no income, particularly the elderly, disabled, and families with dependent children.
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