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kevinzhu · 2020年08月16日

问一道题:NO.PZ2018062007000082 [ CFA I ]

问题如下:

If an underlying asset’s price is less than a related option’s strike price at expiration, a protective put position on that asset versus a fiduciary call position has a value that is:

选项:

A.

lower.

B.

the same.

C.

higher.

解释:

B is correct. On the one hand, buying a call option on an asset and a risk- free bond with the same maturity is known as a fiduciary call. If an underlying asset’s price is less than a related option’s strike price at expiration,the total value of the fiduciary call is X. On the other hand, holding an underlying asset, ST, and buying a put on that asset is known as a protective put. the total value of the protective put is(X-ST)+ST = X . A protective put and a fiduciary call produce the same result.

P+S=C+K S

2 个答案
已采纳答案

xiaowan_品职助教 · 2020年08月18日

同学你好,

再具体一些就是,在T时刻,标的资产价格ST<执行价格K,在此时call option是没有价值的(因为T时刻是到期日,call的时间价值为0,而ST

所以此时C+K = 0+K;另外一方面,在T时刻,put option的价格是K-ST(因为此时put的时间价值也为0,intrinsic value=K-ST),所以此时P+ST = K - ST + ST = K;

所以此时C+K = P + S

 

xiaowan_品职助教 · 2020年08月17日

嗨,爱思考的PZer你好:


同学你好,

到期时ST

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


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