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tjksky · 2024年05月17日

没有理解给出数据和C/A期初 和期末之间的联系和计算逻辑

  1. CFA I
  2. Economics Analysis

NO.PZ2023071902000087

问题如下：

Question

A researcher compiles the following currency exchange data:

A/B C/B

Start of period 1.3578 110.24

Close of period 1.3286 109.52

For the duration, the closest percentage variation in the C/A cross-rate is:

选项：

A.–2.5%. B.1.5%. C.3.6%.

解释：

Solution

The C/A exchange rate at the beginning of the period is calculated as = 1/1.3578 × 110.24 =81.19

The C/A rate at the end of the period is = 1/1.3286 × 109.52 = 82.43

The percentage change in the C/A exchange rate for the period is therefore = 82.42/81.19 - 1 ≈ 1.5% which is approximately 1.5%

Exchange Rate Calculations

•

期初的C/A汇率计算为= 1/1.3578 × 110.24 =81.19

期末的C/A比率= 1/1.3286 × 109.52 = 82.43

因此，这一时期C/A汇率的变化百分比为= 82.42/81.19 - 1≈1.5%，约为1.5%

谢谢

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笛子_品职助教 · 2024年05月17日

嗨，努力学习的PZer你好：


Hello，亲爱的同学~

C/A这种汇率表达式，/后的A为base currency，/前的C为price currency。

汇率数字的波动，总是反应base currency的涨跌。


由于外汇这里涉及到两个货币，确实理解起来有一定难度。

我们可以把汇率里的base currency，理解为商品。


把C/A换一下说法：A是熟牛肉，B是人民币。

期初，一斤熟牛肉的价格是81.19元。

期末，一斤熟牛肉的价格是82.43元。


问，一斤熟牛肉从81.19元到82.43元，涨幅是多少。

计算公式为：82.42/81.19 - 1≈1.5%。


外汇同理，

期初，base currency A，用C计价为81.19

期末：base currency A，用C计价为82.43

则base currency A的涨幅为：82.42/81.19 - 1≈1.5%


----------------------------------------------
努力的时光都是限量版，加油！

tjksky · 2024年05月17日

谢谢老师

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