Here's an example to better understand the gap between rich and poor in today's society. For example, the upper class and middle class who have physical conditions, they will make purchasing power increases. And the poor are still poor so completely diminished purchasing power. The purchasing power of the two classes above overwhelming and cover loss of purchasing power of the poor, so the government and the state did not notice or care about the poor. So it should be the index or formula related to the gap between rich and poor to be able to know how the status and direction of positive change.
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