各位版友好，
课本写说:
If the unemployment rate is below the natural unemployment rate, a labor shortage might put pressure on wage rates to rise, which might feed into inflation.The Fed might consider raising the federal funds rate.
If the unemployment rate is above the natural unemployment rate, a lower inflation rate is expected. The Fed might consider lowering the federal funds rate.
可是失业率不是会大于等于自然失业率吗?
怎么会有可能unemployment rate is below the natural unemployment rate
感谢解惑!