NO.PZ2015122801000063
问题如下：
Which of the following market indexes is least likely to be reviewed periodically to confirm that their constituent assets still meet the qualifications that to be included in the index? Instead, it needs to be reconstituted frequently. An index that is designed to measure:
选项：
A. the growth of commodity prices.
B. the returns of real estate.
C. the yields of commercial paper.
解释：
C is correct.
Because the constituent securities need to be replaced when they mature, an index of commercial paper yields needs to be reconstituted frequently. The other two indexes need to be reviewed periodically to confirm whether their constituent assets still meet the qualifications to stay in the index.
这题答案讲的不是很清晰啊，成熟行业不应该头部比较稳定么？为啥还需要调结构呢？
