關於以下句子? - 英檢

在某篇文章看到：
The 1.9% growth in OECD economies forecast for 2010 still will leave their
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total outpur for the year 4.1 percentage points below potential.
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With that much excess capacity, companies will remain under pressure
to cut prices to keep customers.

請問大家，關於第一段(畫虛線部份)，該如何翻譯呢?，對於“below potential”感到
困惑?
麻煩了解的人幫忙一下了，謝謝。

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