Suppose the data show that each year between 1964 and 2019, 10 percent of all income earners (in the United States)earned a low enough income to be considered poor. It follows that

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Just because someone was part of the 10 percent poor in 1964 does not necessarily mean that they remained in the same income bracket in 2019. This is because there can be upward or downward income mobility over time, and other factors such as education, job opportunities, and economic conditions can all affect a person's income level. Therefore, it is possible that the person who was part of the 10 percent poor in 1964 may or may not be part of the 10 percent poor in 2019.

Suppose the Data Show That Each Year Between 1964 and 2019