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pz-stepsutake · 2020年01月22日

问一道题:NO.PZ2016070201000042

问题如下:

New copula correlation models were used by traders and risk managers during the 2007-2009 global financial crisis. This led to miscalculations in the underlying risk for structured products such as collateralized debt obligation (CDO) models. Which of the following statements least likely explains the failure of these new copula correlation models during the financial crisis?

选项:

A.

The copula correlation models assumed a negative correlation between the equity and senior tranches of CDOs.

B.

Correlations for equity tranches of CDOs increased during the financial crisis.

C.

The correlation copula models were calibrated with data from time periods that had low risk.

D.

Correlations for senior tranches of CDOs decreased during the financial crisis.

解释:

D is correct. During the crisis, the correlations for both the equity and senior tranches of CDOs significantly increased causing losses in value for both.

看了前面的提问和回答,结合讲义99-100页,请问,综合起来是这样么:1)危机时,equity和mezzanine的相关性降低,而senior部分的相关性在提高?2)所以讲义99页下面这句话,前半句,也应该补上是CDO的equity和mezzanine之间?

1 个答案

品职答疑小助手雍 · 2020年01月22日

同学你好,原版书原文如下,其实原本对冲基金的策略就是赚利差,long equity的同时short mezzanine,但是结果少部分债券的降级(GM和福特为例的一部分公司)导致原本的投资级债券一部分大降价变成了垃圾债,但是由于债券多种多样(垃圾债和投资级出现了分化,也就是correlation变小)所以此时equity层和mezzanine的的spread就像讲义100页的图一样,equity的收益率向左上飙升,mezzanine微微向左下偏(向左开口状分化)。