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HG · 2021年03月19日

同涨同跌的问题

NO.PZ2019122802000014

问题如下:

Yankel Stein is the chief investment officer of a large charitable foundation based in the United States. Although the foundation has significant exposure to alternative investments and hedge funds, Stein proposes to increase the foundation’s exposure to relative value hedge fund strategies. As part of Stein’s due diligence on a hedge fund engaging in convertible bond arbitrage, Stein asks his investment analyst to summarize different risks associated with the strategy.

Describe how Credit issues can create concerns for Stein’s proposed hedge fund strategy.

选项:

解释:

Credit issues may complicate valuation since bonds have exposure to credit risk. When credit spreads widen or narrow, there would be a mismatch in the values of the stock and convertible bond positions that the convertible manager may or may not have attempted to hedge away.

“同学你好,Credit issues,指的是convertible bond会面临信用风险,信用风险得大小会影响CB的price,我们这个策略成功的前提就是股债同涨同跌,但是当发生信用风险的时候,股票和债券之间价格的关系就会变化,那么策略就有可能不成功。”老师这是一个回答,我想问的是如果credit出现了问题,CB的price确实会变差,但是stock也肯定会下降啊,那不是还是同涨同跌吗?

2 个答案

韩韩_品职助教 · 2021年03月20日

嗨,爱思考的PZer你好:


是的,同学,delta发生变化,策略就不成功了。

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韩韩_品职助教 · 2021年03月19日

嗨,从没放弃的小努力你好:


同学你好,CB策略中short stock的目的是对冲掉CB中含的call option的delta。或者说,Short stock的数量只根据delta而定。 也就是说,此时构建的对冲策略为,股票涨一块钱,Call就会同涨delta块钱。所以需要short delta份股票去对冲这个call。 可以看到,这个对冲策略里,并没有涉及credit risk/credit spread,也就是暗含了假设无信用风险,或者假设credit spread不变。所以如果credit risk发生变化。之前建立好的对冲就不能实现了。

举例来说,Credit risk/spread变化并不一定非要是一涨一跌,可以是两者同时涨(信用质量变好/credit spread narrow),但此时就不是按照股票涨一块钱,call涨delta块钱这种关系涨了。所以当信用风险发生变化的时候,这个策略当中构建的delta的对冲会变化,而这种变化是此前对冲(delta hedge)没有考虑进去的,也就是会使得之前构建的对冲实现不了。所以这个策略能否盈利也就不确定了。

两者同跌的情况分析类似。

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