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Caren · 2019年09月21日

问一道题:NO.PZ2017100901000025 [ CFA I ]

为什么A不对?

我的理解是:首先,用的是基期篮子。其次,虽然质量向好,但价格没变。所计算出来拉氏指数没变化的。

何老师讲课的例子是:用基期篮子,质量向好且价格上涨,计算的拉氏指数是bias 高估的。

问题如下图:

选项:

A.

B.

C.

解释:

2 个答案

Wendy_品职助教 · 2019年10月25日

抱歉,是我的手误,是以0为分界点。

Wendy_品职助教 · 2019年09月21日

•Inflation rate is the percentage increase in the price level, typically compared to the prior year.

inflation rate就是价格变动的百分比,商品涨价了 inflation rate >1;降价了, inflation rate <1;价格不变, inflation rate=1。

商品质量提高了,但是价格没变,说明该商品实质上是降价了,说明商品实际上deflation,该商品inflation rate应该是小于1。但是 inflation rate 计算的时候没有考虑到质量的提高,在考虑该商品的时候,算成了它的inflation rate=1,所以是高估。

俏阿璃_ · 2019年10月21日

inflation rate为什么会以1作为分界点?不是应该是零吗?何老师视频里讲的也是deflation的情况是inflation rate is negative

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