Final answer:
The top quintile of the U.S. population has seen the greatest change in income over the last generation.
Step-by-step explanation:
The top quintile of the U.S. population has seen the greatest change in income over the last generation. In 2020, this quintile received 52.2% of income, which is the highest share compared to the other quintiles. Additionally, the share of income going to the top quintile has been increasing over time, indicating a growing income inequality.