短语讲解：

1. The report is based on an International Monetary Fund study.

base on 使建立在…基础上
例句："Base on Yunfu, orient to the world and aim at the future."
立足云浮,面向世界,走向未来。

2. Many people are concerned about the issue.

concern about 使（自己）关心…
例句：She showed great concern about you.
她很为你担心。

3. It found that a one percent increase in the earnings of the richest 20 percent of people led to a nearly one percent decrease in GDP growth over a five-year period.

lead to 导致
例句：He speculated that this might lead to a success.
他推测这可能会导致成功。
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