NO.PZ2021071301000010
问题如下：
Which of the following statements best describes the characteristics of economic indicators?
选项：
A.Leading indicators track the entire economy B.Lagging indicators do not need to be modified when measuring past conditions.C.The combination of leading and coincident indicators can make forecasting more effective.
解释：
C is correct.
No single indicator is completely correct. Their combination - which can be influenced by a variety of economic determinants - can provide the most effective performance signals.
虽然没有一个经济指标是确定的，但综合这些指标——它们可能受到各种经济因素的影响——可以提供最强烈的业绩信号。
A的indicator哪些不会track 整个economy呢？B又是为什么错呢
