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大铭 · 2022年02月22日

为什么这题中不加上2.75

* 问题详情,请 查看题干

NO.PZ202112010200001603

问题如下:

What is the expected excess spread of the BBB rated bond for an instantaneous 50 bp decline in yields if the bond’s LGD is 40% and the POD is 0.75%?

选项:

A.

1.95%

B.

2.45%

C.

2.70%

解释:

C is correct. The expected excess spread is equal to the change in spread multiplied by effective spread duration (–(EffSpreadDur × ΔSpread)) less the product of LGD and POD, which we can solve for to get 2.70% (=(–6 × 0.50%) – (0.75% × 40%)).

为什么expected excess spread不等于2.75-(-0.5*6)-0.4*0.75,而只有后面一部分?

1 个答案

pzqa015 · 2022年02月22日

嗨,爱思考的PZer你好:


题目说,an instantaneous 50 bp decline in yields,instantaneously表明是瞬时变动,那么第一项spread*t中的t=0。

原版书对于这个计算讲的比较乱,教研老师讨论后得到如下两类解题思路:

1、只要有instan,第一项spread就乘以t=0,第三项LGD*PD不乘0了,LGD*PD是多少就是多少,这点课后题就是这么做的。

所以,如果是Instan,Excess spread这么算:

EXR = Spread 0 × 0 - spread duration × △ Spread - LGD × PD

2、若没有instan,那么持有期是多少(小于1年),第一项Spread和第三项LGD*PD都要乘以t,这是例题这么做的。所以Excess spread这么算:

EXR = Spread 0 × t - spread duration × △ Spread - LGD × PD×t

----------------------------------------------
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