请问decrease before an increase如何理解？在之后指标增加之前下降？

问题如下：

Which of the following indicators is most likely to decrease before an increase in average bank prime lending rate?

选项：

Change in consumer price index for services.

Inventory-sale ratio.

ISM new order index.

解释：

C is correct.

Both the change in consumer price index for services and the Inventory-sale ratio are lagging indicators, while only ISM new order index is a leading indicator.

考点：Economic Indicators

解析：average bank prime lending rate 是一个滞后指标，依据题意，我们需要选择一个同步指标或者领先型指标。

B选项和A选项都是滞后型指标，所以不入选。只有C选项是领先型指标，入选。