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Zwwei · 2022年03月28日

Duration的问题,单位需要写Year吗?

NO.PZ2019100901000020

问题如下:

MegaWorld Bancorp has an equity capital ratio for financial assets of 9%. The modified duration of its assets is 2.0 and of its liabilities is 1.5. Over small changes, the yield on liabilities is expected to move by 85 bps for every 100 bps of yield change in its asset portfolio.
Compute the modified duration of the bank’s equity capital.

解释:

Using Equation 8, A ÷ E = 1/0.09 = 11.11; (A ÷ E) –1 = 10.11; D*A = 2.0; DL* =
1.5; and Δ
i ÷ Δy = 0.85.
Therefore, the modified duration of shareholders’ capital is:

DE* = (11.11 × 2) – (10.11 × 1.50) × 0.85 = 9.33

Duration的问题,单位需要写Year吗?就像上面那一题一样。

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发亮_品职助教 · 2022年03月29日

嗨,从没放弃的小努力你好:


Duration的问题,单位需要写Year吗?就像上面那一题一样。


不用写单位。

Duration是利率的敏感度,代表利率变动1单位时,债券(资产)的价格变动多少幅度,这就是一个弹性系数而已,理论上说是没有单位的。


但实际上,利率敏感度Duration与债券期限Maturity,以及现金流发生的平均时间Macaulay duration有直接的线性关系,而Maturity与Macaulay duration的单位是年,于是,有些地方(财经新闻与一些教科书),会给利率敏感度Duration也加上单位Years,其实这么写不标准。


我们答题的话,利率敏感度Duration,不用写years单位。题干出现了Duration加了单位years,这是作者的使用习惯,在机构IPS这里,Duration基本都是利率敏感度,所以可以忽略这个单位。


但注意,在固定收益里,有Macaulay duration的考点,Macaulay duration是现金流发生的平均时间,是一个时间概念,因此在固收那边Macaulay duration会加单位Years。

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