请问这里算value weighted index不是和算price return index一样的吗？

问题如下：

Benedict, an analyst from an investment company, recently gathered the following data for a value-weighted index comprised of securities G,H,I:

What is the value-weighted index' return over the period?

选项：

A.

6.78%.

B.

3.94%.

C.

12.40%.

解释：

It is the percentage change in the market value over the period:

Percentage change is$\frac{26,400}{25,400}-1\approx0.0394=3.94\%$ with rounding, is calculated as the below table:

考点：市值加权的指数

1、value-weighted index就是market-capitalization weighting市值加权的意思。

2、很多同学问为何上述计算要“减 1”。我们现在要求的是收益率，26400-25400=1000才是收益，所以收益率等于1000/25400=3.94%，因此上述公式需要减掉1。