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Evelynislost · 2021年04月26日

是不是对于利率二叉树来说,风险中性概率pai-u ,pai-d 也不一定恒等于0.5,讲义中的例子仅看成是一种特例?

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NO.PZ201702190300000309

问题如下:

9.Which of Sousa’s reasons for the decrease in the value of the interest rate option is correct?

选项:

A.

Reason 1 only

B.

Reason 2 only

C.

Both Reason 1 and Reason 2

解释:

A is correct.

Reason 1 is correct: A higher exercise price does lower the exercise value (payoff) at Time 2. Reason 2 is not correct because the risk-neutral probabilities are based on the paths that interest rates take, which are determined by the market and not the details of a particular option contract.

是不是对于利率二叉树来说,风险中性概率pai-u ,pai-d 也不一定恒等于0.5,讲义中的例子仅看成是一种特例?

2 个答案

WallE_品职答疑助手 · 2021年04月27日

嗨,努力学习的PZer你好:


我的意思是这一部分是有u and d这个概念的,也就是股票的期权二叉树。


后面这一部分,也就是您说的题干,是利率二叉树,是没有u and d这个概念的!!上下走的概率都是50% (the risk neutral probability of an up move)

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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!

WallE_品职答疑助手 · 2021年04月27日

嗨,从没放弃的小努力你好:


这一题的二叉树中的pai u pai d咱们一般是用在以股票为交易的二叉树里面的哟。讲义里面大多数情况是利率二叉树的,所以上下都是50%的概率,您看他这个题目里面的说的the risk neutral probability of an up move is 0.5

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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!

Evelynislost · 2021年04月27日

题干不是interest rate option 吗?怎么能是股票的呢?

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NO.PZ201702190300000309问题如下 Whiof Sousa’s reasons for the crease in the value of the interest rate option is correct? A.Reason 1 only B.Reason 2 only C.Both Reason 1 anReason 2 A is correct. Reason 1 is correct: A higher exercise pries lower the exercise value (payoff) Time 2. Reason 2 is not correbecause the risk-neutrprobabilities are baseon the paths thinterest rates take, whiare terminethe market annot the tails of a particuloption contract.中文解析根据c=max{0,ST -X}可知,当行权价越高,看涨期权的行权价值越低;且期权的行权价值与风险中性概率无关。因此只有表述1正确,选Rocha asks Sousa why the value of a similin-the-money interest rate call option creases if the exercise priis higher. Sousa provis two reasons.Reason 1 The exercise value of the call option is lower.Reason 2 The risk-neutrprobabilities are change我的翻译R询问了S为什么,如果执行价格变高的话,一个相似的in-the-money的利率call option会下降的原因。第一个理由执行价格变低了。Whiof Sousa’s reasons for the crease in the value of the interest rate option is correct?A Reason 1 onlyB Reason 2 onlyC Both Reason 1 anReason 2哪一个关于call option价格下降的原因是正确的。解答根据c=max{0,ST -X}可知,当行权价越高,看涨期权的行权价值越低。 →这句话我没有异议。我疯了……黄色部分的解答这句话我没有异议。但是给出的第一个理由,也就是紫色highlight的两句话,执行价格是变低啊,变低的话,call option的价格是上涨啊……那怎么会是call option下降的原因呢???然后这不明显和题目里这剧执行价格变高相违背吗?我凌乱了……

2022-05-14 16:38 1 · 回答

NO.PZ201702190300000309 Rocha asks Sousa why the value of a similin-the-money interest rate call option creases if the exercise priis higher. Sousa provis two reasons. Reason 1 The exercise value of the call option is lower. 我没看明白她问的什么意思。谢谢。

2021-09-02 23:56 1 · 回答

NO.PZ201702190300000309 为什么reason2不正确?没有看明白

2021-07-24 20:00 1 · 回答

Reason 2 only Both Reason 1 anReason 2 A is correct. Reason 1 is correct: A higher exercise pries lower the exercise value (payoff) Time 2. Reason 2 is not correbecause the risk-neutrprobabilities are baseon the paths thinterest rates take, whiare terminethe market annot the tails of a particuloption contract.如果不是利率二叉树,而是股票二叉树,风险中性概率是否也不受X影响?计算公式里没有涉及X

2021-05-18 18:51 1 · 回答