Answers
Option is a financial derivative which is based on underlying assets and it provide its buyer a right to buy or sell the underlying assets at predefined price on maturity. Option doesn't put any obligation to its buyer. However, option writer has obligation to transact if buyer of option exercise the option.
There are two types of Options
Call option - give right to Buy
Put option - give right to sale
Forward is a contract between two parties to transact underlying assets at predefined price on delivery date. It contains obligation to parties.
Following are payoff of the Call option, Put option and Forward
Call option = Max((Sale Price of Stock - Strike Price),0)
Put option = Max((Strike Price-Sale of stock Price),0)
Short Forward = Delivery Price - Stock Price
Further, Option payoff for option seller is exact opposite to the Payoff of option buyer , which means
Payoff for short call = - Max((Sale Price of Stock - Strike Price),0)
In above case, the delivery Price of Forward and Strike Price of Option is same i.e $ 100
In Position-1
buy 3-month European put & sale 3-month European call option
Assuming both option has same premium and Buy Put and Short Call nullify the Premium.
As option provide right, so option is exercised only if it provide profit to its buyer.
In case of Put option -
Put option exercised only if Stock price is below to strike price on maturity.
In case of Call option
Call option exercised only if stock price is above to strike price on maturity.
Thus in our case, if stock price goes up put option exercise or if it goes down then buyer of call exercise it.
If price goes below to strike price, then payoff of Position-1
Strike Price - Stock Price = Positive of difference between Strike Price ans Stock Price
If price goes above to strike price, then payoff of Position-1
- (Stock Price - Strike Price) = Negative of difference between strike Price and Stock Price
Payoff of forward contract - Position-2
If price goes below delivery price
Delivery Price - Stock Price = Positive of difference between Delivery Price and Stock Price
If price goes above delivery price
Delivery Price - Stock Price = Negative of difference between Delivery Price and Stock Price
Please note- The delivery Price and Strike is same $ 100. Thus, whether goes up or down the payoff would be same for both positions.
Please refer to below spreadsheet for plot of Payoff of Position-1 and Position-2 vs.
Stock price for better understanding.
Thus, It is correct that Both position have same payoff for any price of stock on maturity.
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