Call Put Parity

In: Business and Management

Submitted By ericcarbon
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Synthetic Forward and Put­Call­Parity A synthetic long forward can be created by purchasing a call option and writing a put option with the same strike price and the same expiration date. Let’s say, that an investor buys a $500‐strike call option and sells a $500‐strike put option, both options have the same expiration time T. At T, the spot price will be equal to, above or below the strike price. If the spot price is above the strike price K, the investor will exercise the call option and buy the underlier for $500. The put will not be exercised. If the spot price is below the strike price the written put will be exercised against the investor, forcing him to buy the underlier at $500. The call will expire worthless. In either case, the underlier will be purchased at the strike price. The payoff of this combined position is

max{0, S - K}- max{0, K - S} = S - K
Call Put

but this is actually the payoff of a long forward contract expiring at time T and with a forward price of $500. Be aware of the differences between an original long forward and a synthetic long forward: (i) the original long forward has no upfront premium payment while the synthetic long forward requires a net option premium (= abs[Call(K,T) – Put(K,T)] ) as upfront payment. (ii) At expiration at time T we pay the forward price with the original long forward, whereas with the synthetic long forward we pay the strike price. Let F0,T denote the “no‐arbitrage” forward price. This means you have to pay $0 today and at time T you are obliged to buy the asset at F0,T. The cost of the contract today is the present value of F0,T, PV(F0,T). Now we pay Call(K, T) – Put(K, T) today to buy the option on that asset for K at time T which results in a cost at time 0 of Call(K, T) – Put(K, T) + PV(K). And using the “no‐arbitrage” pricing, the net cost of the asset must be the…...

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