| UID223346 帖子483 主题49 注册时间2011-7-11 最后登录2013-9-12 
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40#
 
 发表于 2012-4-3 14:47 
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| At time = 0, for a put option at exercise price (X) on a newly issued forward contact at FT (the forward price at time = 0), a portfolio with equal value could be constructed from being long in: | | A) 
 | the underlying asset, long a put at X, and short in a pure-discount risk-free bond that pays X – FT at option expiration. | 
 |  | | B) 
 | a risk-free pure-discount bond that pays FT – X at option expiration and long in a put at X. | 
 |  | | C) 
 | a call at X and long in a pure-discount risk-free bond that pays X – FT at option expiration. | 
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 Utilizing the basic put/call parity equation, we're looking for a portfolio that is equal to the portfolio mentioned in the stem (a put option). The put-call parity equation is c0 + (X – FT) / (1+R)T = p0. Since (X – FT) / (1+R) is actually just the present value of the bond at expiration, the relationship can be simplified to long call + long bond = put.
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