As working and middle-class families flee inner-city poverty areas, the most disadvantaged population is consolidated in urban ghettos. this phenomenon results in a poverty effect.

poverty concentration effect.

Explanation:

According to my research on different economic class families, I can say that based on the information provided within the question this phenomenon results in a poverty concentration effect. This effect  refers to a spatial density of socio-economic deprivation which can have effects on surrounding neighborhoods that are not classified as "high-poverty," and therefore almost eliminating overall economic potential for the people.

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the density would be a smaller number.