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摇一摇 · 2023年07月15日

是如何得出求的是K呢

NO.PZ2018062007000085

问题如下:

Under put–call–forward parity, which of the following transactions is risk free?

选项:

A.

Short call, long put, long forward contract, long risk- free bond.

B.

Long call, short put, long forward contract, short risk- free bond.

C.

Long call, long put, short forward contract, short risk- free bond.

解释:

A is correct. Purchasing a long forward contract and a risk- free bond creates a synthetic asset. Combining a long synthetic asset, a long put, and a short call is risk free because its payoffs produce a known cash flow of the value of the exercise price.

中文解析:

这道题考察的是put-call parity的一个变形。

我们知道S是一个不确定的现货价格,那么假设持有S同时short forward contract,就可以得到一个无风险收益,可以等效为一个risk-free bond,也就是S + short forward contract = long risk-free bond,等式两边变换一下可以得到:S = -short forward contract + long risk-free bond = long forward contract + long risk-free bond;

再把这个等式带入到P + S = C + K,得到P + long forward contract + long risk-free bond = C + K,K是无风险债券 Risk free bond,

K = P + long forward contract + long risk-free bond - C,这样就构造了一个无风险组合,A选项对。

是如何得出求的是K呢

2 个答案

Lucky_品职助教 · 2023年08月03日

嗨,从没放弃的小努力你好:


k和FP都使用的是risk-free bond,但是这道选择题的正确答案是A,刚好是k,首先c选项是排除掉的,call和put在构建risk-free是不能同时long的,其次put和forward的方向是要一致的,所以B错了

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Lucky_品职助教 · 2023年07月17日

嗨,努力学习的PZer你好:


put–call–forward parity中两个risk free bond的面值不同~ protective put with forward contract 中risk free bond面值是forward price,会有债券本身需要面临的风险。而题干问的是无风险,意味着这些组合应当能获得无风险收益的情况。所以计算的是k

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就算太阳没有迎着我们而来,我们正在朝着它而去,加油!

信鸽子 · 2023年08月03日

想问一下,就是,为什么题目所说的risk-free bond是k而不是另一个无风险利率债券,就是面值是F0(T)的那个,考试题目怎么称呼另一个无风险利率的债券呢

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