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过儿 · 2022年04月26日

如果这题

NO.PZ2018062007000078

问题如下:

Assume a call option’s strike price is initially equal to the price of its underlying asset. Based on the binomial model, if the volatility of the underlying decreases, the lower of the two potential payoff values of the hedge portfolio:

选项:

A.

decreases.

B.

remains the same.

C.

increases.

解释:

B is correct. When the volatility of the underlying decreases, the value of the option also decreases, meaning that the upper payoff value of the hedge portfolio combining them declines. However, the lower payoff value remains at zero.

中文解析:

题干的意思是当基础资产价格波动降低时,这个call option的潜在的较低payoff会怎样变化。

我们知道期权较低的payoff就是它不行权的时候,这个时候它的payoff是0;

当基础资产波动降低时,基础资产价格涨的更高的可能性就会降低,那么潜在的upper payoff就会降低,但lower payoff仍然是它不行权的时候的value,也就是还是0.

这题主要是因为K=P,所以trade off是(0,0)对吗

K>P得时候,volitility上升会怎么样?

K

在这两种情况下,vollitility下降就是相反得情况对吗?

1 个答案

Lucky_品职助教 · 2022年04月28日

嗨,从没放弃的小努力你好:


建议同学在做题时多思考,自己动手画一画期权收益图哦

K>P,volatility上升,更有机会行权,根据看涨期权的收益图,可知最低payoff是0,最高是无限大;

K

volatility下降,也不会改变收益图的状态,最低最高payoff还是一样的

----------------------------------------------
虽然现在很辛苦,但努力过的感觉真的很好,加油!

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