According to the Pew Charitable Trust methodology for identifying the middle class, for the period from 1971 to 2015, the lowest income class has

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The Pew Charitable Trust methodology for identifying the middle class shows that from 1971 to 2015, the lowest income class has increased from 16% to 20% of the population, indicating a growth in the proportion of the population falling into this income category.

According to the Pew Charitable Trust Methodology for Identifying the Middle