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徐威廉 · 2021年07月26日

为什么选C?

NO.PZ2019103001000071

问题如下:

Exhibit 1 shows information for three BBB rated bonds issued by a large automotive company. Gerber asks Petit to interpret the data in the table and notes that the current interest rate environment is characterized by a positively sloped yield curve

Petit makes three observations about these bonds.

Observation 1 We should buy Bond 1 because the difference between its Z-spread and OAS is the largest.

Observation 2 We prefer Bond 1 to Bond 3 because Bond 1 has a greater Z-spread.

Observation 3 Bond 2 is a non-callable bond because its option-adjusted spread (OAS) is similar to the bond’s other three spread levels.

Which of Petit’s observations about the three BBB rated bonds is most likely correct?

选项:

A.

Observation 1

B.

Observation 2

C.

Observation 3

解释:

C is correct.

The OAS for Bond 2 is close to the bond’s other spread levels and thus indicates that there is little embedded optionality in the bond. As a result, Bond 2 is most likely not callable.

这种题选择哪一个bond的逻辑能不能从头到尾说一遍?
1 个答案
已采纳答案

pzqa015 · 2021年07月27日

嗨,努力学习的PZer你好:


同学你好

这道题的解题思路是这样的。


首先,对于callable bond,有这样一个结论,OAS=Zspread-option spread

(对于callable bond,Zspread包括对投资人承担credit risk、liquidity risk以及short option risk的风险补偿。而OAS是剔除short option后的风险补偿,也就是只补偿债券投资人承担的credit risk、liquidity risk,对于callable bond的relative value,我们应比较OAS而不是Zspread)


其次,根据这个结论我们分析题干的三只债券。

由于Bond2的Zspread与OAS相接近,因此,可以认为bond2为option free bond。

Bond1与Bond3的Zspread大于OAS,所以,可以推断出bond1与bond3为callable bond。


最后,分析选项3个observation。


Observation1说,我们应该选择Bond1因为它的Zspread与OAS差是最大的,这是凑选项的,Zspread与OAS有difference只能判断出它是callable bond,无法根据这个difference得出relative value大小的结论。

Observation2说,根据Zspread,我们应该选择bond1,这显然是错误的,前面说过1与3都是callable bond,对于callable bond,比较relative value要看OAS而不是Zspread,这句话正确的表述应该是we prefer bond 3 to bond 1 because bond3 has a greater OAS。

Observation3说,bond2是non callable bond因为它的Zspread与OAS相近,这是正确的。


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