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papher · 2020年09月02日

问一道题:NO.PZ2016082406000072

问题如下:

An investor has sold default protection on the most senior tranche of a CDO. If the default correlation decreases unexpectedly, assuming everything else is unchanged, the investor’s position will

选项:

A.

Gain value since the probability of exercising the protection falls.

B.

Lose value, since the investor^ protection will gain value.

C.

Neither gain nor lose value since only expected default losses matter and correlation does not affect expected default losses.

D.

It depends on the pricing model used and the market conditions.

解释:

ANSWER: A

The value of the senior tranche depends on the default correlation. If this goes down, the distribution of losses will be more diversified, or tighter, which makes it less likely that losses will wipe out the lower tranches. Hence, the value of senior tranche goes up. Selling default protection is equivalent to being long the senior tranche, which creates a gain under these conditions.

default correlation指的是不同层次之间的还是senior tranch 内部的correlation呢?

1 个答案
已采纳答案

小刘_品职助教 · 2020年09月03日

同学你好,

这里的default correlation是指所有底层资产的correlation,在资产证券化的时候,在投资端分了senior、equity等层次,但他们对应的底层资产都是一样的,即底层资产不会区分出哪些对应到senior层。