Which quintile was the only grouping that saw a substantial increase in its share of the national income between 1951 and 2017?

Question

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According to the question, we are asked which quintile saw a substantial increase in its share of the national income between 1951 and 2017. The term "substantial" implies a significant increase that is more than insignificant or minor in nature. The highest quintile refers to the top 20% of earners, which includes the wealthiest individuals and households. Various studies and reports have shown that this group has consistently experienced an increase in their share of the national income over the years, while the share of other quintiles has remained relatively stagnant or declined. Therefore, the answer to the question is A) Highest quintile.

Which Quintile Was the Only Grouping That Saw a Substantial