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yiml · 2023年12月03日

请问这个 benchmark. spread 是不是就是yield spread?

* 问题详情,请 查看题干

NO.PZ202209060200004502

问题如下:

In Island’s conversation with West, the spread measure that dealers often quote Island is most likely the:

选项:

A.I-Spread.

B.G-spread.

C.benchmark spread.

解释:

Solution

C is correct. The benchmark spread is a simple way to calculate a credit spread; it subtracts the yield on a recently issued benchmark-sized security with little or no credit risk (benchmark bond) of a particular maturity from the yield on a credit security. Typically, the benchmark bond is an on-the-run government bond. A problem with benchmark spread is the potential maturity mismatch between the credit security and the benchmark bond. Unless the benchmark yield curve is perfectly flat, using different benchmark bonds will produce different measures of credit spread.

A is incorrect because the I-spread normally uses swap rates that are denominated in the same currency as the credit security.

B is incorrect. The G-spread is the spread over an actual or interpolated government bond.

请问这个 benchmark. spread 是不是就是yield spread?

1 个答案

pzqa31 · 2023年12月04日

嗨,从没放弃的小努力你好:


Benchmark spread是广义的spread概念,benchmark可以用任何收益率作为benchmark。

其中Benchmark spread有一个缺点就是:标的债券的maturity可能和benchmark的maturity不匹配。即mismatch问题,就是题干信息那句话的最后一部分。


当benchmark是government bond时,就是G-spread.

当benchmark是swap时,就是I-spread。

标的债券的Yield减去benchmark的yield就得到各种spread。


当然需要让标的债券的maturity和Benchmakr的maturity一致。对于G-spread,和I-spread来说,如果maturity不一致时,可以用interpolation找到对应maturity的Benchmark yield.

如标的债券的maturity是7年,只有5年和10年的国债信息,通过5年和10年的,用线性差值法找到7年的yield。

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