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Sofia nice · 2024年05月30日

为啥要乘以100?什么时候要这样统一量纲

NO.PZ2023061903000027

问题如下:

Q. The JPY/AUD spot exchange rate is 82.42, the Japanese yen interest rate is 0.15 percent, and the Australian dollar interest rate is 4.95 percent. If the interest rates are quoted on the basis of a 360-day year, the 90-day forward points in JPY/AUD would be closest to:

选项:

A.–377.0.
B.–97.7. C.98.9.

解释:

B is correct. The forward exchange rate is given by:

FJPYAUD=SJPYAUD1+rJPYτ1+rAUDτ=82.421+0.0015903601+0.049590360=82.42×0.98815=81.443.

The forward points are as follows:

100 × (F × S) = 100 × (81.443 – 82.42) = 100 × (–0.977) = –97.7.

Because the spot exchange rate is quoted with two decimal places, the forward points are scaled by 100.

Because the spot exchange rate is quoted with two decimal places, the forward points are scaled by 100.为什么?

2 个答案
已采纳答案

笛子_品职助教 · 2024年05月30日

嗨,从没放弃的小努力你好:


Hello,亲爱的同学~

同学这里先要理解point的含义。

1个point,是指最小变动单位。

因此,-97.7,是指-97.7个最小变动单位。

而最小变动单位,又取决于汇率数字小数点位数。


理解以上知识点后,我们再看这个问题。

本体题目中给的汇率数字是:82.42。

这个数字,是2位小数。表示最小变动0.01。

因此,需要乘以100。



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李骁 · 2024年10月07日

关于forward exchange rate in points,何老师在课程讲解里有提到points是指万分之一。这个情形,和根据exchange rate小数点后位数来确定scale的方法,分别适用什么情况呢?有点困惑。

笛子_品职助教 · 2024年10月08日

嗨,从没放弃的小努力你好:


关于forward exchange rate in points,何老师在课程讲解里有提到points是指万分之一。

1个points是指汇率的最小变动单位。

最小变动单位取决于汇率小数点位数。

对于有4位小数点的汇率,最小变动单位是0.0001,1个point也就是万分之一。

何老师讲的是4位小数的汇率这种情形。

如果小数点位数不是4位,例如本题是两位,最小变动单位是0.01,也就是1个point是百分之一。


这个情形,和根据exchange rate小数点后位数来确定scale的方法,分别适用什么情况呢?有点困惑。

何老师讲的方法,也是根据小数点位数来确定scale。是统一的。

何老师说的万分之一,是有特定语境的。特定语境就是,汇率的小数点有4位数。

一个point并不是固定的万分之一,也可以是百分之1,例如本题。



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