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yucaosu · 2020年11月08日

问一道题:NO.PZ2019103001000078 [ CFA III ]

问题如下:

Megan Easton is a portfolio manager with Dynamo Investment Partners (Dynamo) and manages a bond portfolio that invests primarily in investment-grade corporate bonds with a limited amount of US government bonds. Easton meets with John Avelyn, a newly hired analyst, to discuss the structure and management of this investment portfolio, as well as some possible changes to the portfolio composition.

Easton begins the meeting by stating her belief that the credit spread is the single most important measure that investors use when selecting bonds. Among the various credit spread measures, including the G-spread, I-spread, and Z-spread, Easton prefers the G-spread.

A benefit of Easton’s preferred credit spread measure is that it:

选项:

A.

provides a good measure of credit spread for bonds with optionality.

B.

uses swap rates denominated in the same currency as the credit security

C.

reduces the potential for maturity mismatch.

解释:

C is correct.

The G-spread is the spread over an actual or interpolated benchmark (usually government) bond. A benefit of the G-spread is that when the maturity of the credit security differs from that of the benchmark bond, the yields of two government bonds can be weighted so that their weighted average maturity matches the credit security’s maturity.

你好,请问B选项什么意思,谢谢
1 个答案

WallE_品职答疑助手 · 2020年11月08日

同学您好,

B是用与credit security以同一货币计价的掉期利率。

这一题之所以选择C,是因为

G-spread的目的就是衡量非国债承担的信用风险。所以在计算时,使用Maturity-match,目的就是保证公司债和国债的期限一致,唯一的区别源自Credit risk,所以减出来的差就只代表由信用风险带来的补偿。

因为债券的期限也会影响到债券的收益率,一般长期债的收益率大于短期债,有一部分原因就是长期债面临更大的利率风险,债券投资者很长期才能回收本金,面临“夜长梦多”的风险。所以为了补偿投资者,长期比短期多一块为期限的补偿。

在求信用风险G-spread时,为了让求出来的G-spread只反映信用状况,就让减号前后债券收益率的其他影响因素相同,比如期限相同、为期限的补偿相同。这样减出来的差值就只反映比较纯的信用质量差异。

因为国债的Maturity只有特定的几个,市场上找Maturity一致的国债比较难,线性插值法就解决了期限匹配的问题。

不选择B是因为,I Spread ( Swap rate of bond - Swap rate of benchmark), 但他不适用于线性差值发,因此不选。