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Pina · 2020年06月23日

问一道题:NO.PZ201702190300000309

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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.

老师好 这题说drop in exercise price , 是否可以理解为, drop exercise price 后 V call 就是Call 的Value 更大了因为更容易in the money. 然后利率和V 反比,所以从Value of interest rate 来看, drop in exercise price 会 decrease the interest rate option value? 谢谢.

Pina · 2020年06月23日

哦 这里reason 1 是说drop in value of the call option 不是 drop exercise price. 是相对应之前说的 ”Rocha asks Sousa why the value of a similar in-the-money interest rate call option decreases if the exercise price is higher. “ 明白了。 还想确认一下, V call option 和V interest rate call option 是反比关系吗?

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WallE_品职答疑助手 · 2020年06月24日

这题需要判断的是利率期权的价值,不是一看到利率,就想到债券(利率和债券价值成反比),所以利率和V反比说不通。

借用之前助教的解释:

exercise price指的是行权价格。比如说我们买入了一个看涨期权,约定以50块钱在T时刻买入中石油股票,那么这个50块钱就是执行价格,也就是exercise price。

exercise value是指一个in the money的option在当前时刻行权的价值,比如说我们买入了一个看涨期权,约定以50块钱在T时刻买入中石油股票,如果当前时刻的股价是60的话,那么exercise value=60-50=10块钱

题目是问为什么利率看涨期权的执行价格升高,看涨期权的价值会降低。因为执行价格升高,exercise value=市场价格-执行价格,看涨期权的价值等于exercise value+时间价值;所以exercise value 降低,期权的价值降低。

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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

NO.PZ201702190300000309 是不是对于利率二叉树来说,风险中性概率pai-u ,pai-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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