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mino酱是个小破货 · 2024年07月10日

请老师详解B项,应该用啥?

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NO.PZ202209060200004204

问题如下:

In Larent’s discussion about the top-down approach to portfolio construction, she is most likely correct about:

选项:

A.assessing the impact of yield curve reshaping.

B.maturity weighting related to a change in spread curve.

C.the allocation of lower-quality bonds in a credit portfolio.

解释:

Solution

C is correct. Larent’s comment about credit portfolios that are overweight lower-quality bonds likely outperforming a global benchmark whenever global economic conditions improve is correct.

A is incorrect. Effective duration is used to measure the impact of a parallel change in the yield curve, not a steepening in the yield curve.

B is incorrect. With respect to the spread curve, overweighting shorter-maturity bonds and underweighting longer-maturity bonds is not optimal whenever there is an expectation that a relatively wide spread curve will flatten. When a wide spread curve flattens, the yields of longer-maturity bonds decline by a magnitude that is greater than the magnitude of changes (up or down) in the yields of shorter-maturity bonds. Accordingly, the optimal portfolio construction strategy is to be underweight shorter-maturity bonds and overweight longer-maturity bonds.

effective duration不是P1-Po/y吗?事后和事前,含option都可以,为啥现在情况不可以。这题正确说法是不是empirical duration,谢谢老师

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发亮_品职助教 · 2024年07月11日

effective duration不是P1-Po/y吗?


Effective duration是下面这个计算公式:


PV0是初始状态的债券价格。△Curve是一次利率改变的幅度。

以PV0为基础,让利率下降△curve,我们会得到一个更大的债券价格,记为PV(-),里面的负号代表的是利率下降△curve

以PV0为基础,让利率上升△curve,会得到一个更小的债券价格,记为PV(+),加号代表利率上升

则,以初始价格PV0为基数,债券价格的改变幅度是:【(PV-) - PV(+)】/PV0

以上是债券价格的改变幅度△Price%


duration按定义是利率改变1单位时,引起的债券价格改变幅度,他是一个比值,使用债券价格改变幅度△price%再除以利率的改变幅度△curve来计算。


由于(PV-) - PV(+)这里面的价格变动是因为利率变动了2个△curve。所以计算Effective duration时需要注意债券价格与利率的变动幅度是针对2×△curve的。


债券价格改变幅度【(PV-) - PV(+)】/PV0再除以利率改变幅度2×△curve就是ED

整理一下就是原版书给的公式。


这题正确说法是不是empirical duration


还不是。

提问里面说的effective duration应用场景没什么问题。但是effective duration和modified duration一样,是一个整体指标,衡量的是整条利率曲线平行改变带来的债券价格波动。


但题干的说法是利率曲线发生非平行移动,是steepening in the yield curve,这种非平行移动就不能用平行移动的指标effective duration来衡量,所以下面这个题干的说法就是错误的:

We can use effective duration to assess the impact of a likely steepening in the yield curve.

非平行移动的影响就只能看key rate duration。


题干上句关于Effective duration的描述是和选项A相关的(assessing the impact of yield curve reshaping)。我们不能用ED平行移动的指标来assessing非平行移动的impact。所以本题A错误。


本题的B选项和下面题干这句相关:we can underweight longer-maturity bonds given my expectation that the relatively wide spread curve will flatten

他预测未来的spread curve将会变得更加平坦(flatten),于是他要underweight长期债券。

这个说法错了,spread curve变得平坦,意思就是相对于短期spread,长期spread会大幅下降,既然长期spread大幅下降,说明长期债对应的折现率YTM会大幅下降,我们应该overweight长期债券,享受spread下降带来的债券价格上升。

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