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Call Put Parity Essay

685 words - 3 pages

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

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 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 same whether through options or forward contract, that is   

Call(K, T) – Put(K, T) = PV(F0,T‐K).                                                                                         (CP.1)                                                  That means:  {The premium for a Call Option (at strike price K and expiration at time T)  minus  the premium for a Put Option (at strike price K and expiration at time T)}  equals  {the present value of the difference between the “no‐arbitrage” forward price (with the same  expiration time T) and the option’s strike price.}     

  Let us have a closer look at the different terms:  PV(F0,T)  is equal to the current spot price of the underlier, and therefore represents a long position in  the underlier.  PV(K)  is the present value of an amount K payable in T years; it represents a T‐year‐zero‐coupon  bond with maturity value K.    Let us show the Put‐Call‐Parity with the help of the following graphic: 

  Exhibit CP.1: Put‐Call‐Parity (Kind Courtesy of Glyn Holton – www.riskglossary.com)  We have two portfolios: One comprises a Call Option and a cash amount (the PV of the call  options strike price), and the other portfolio comprises a Put Option and the underlier.  When  the expiration value of each of these portfolios is the same, then  the “no‐arbitrage”  opportunity tells us that the present value of these expiration values must also be the same.  And this is called Put‐Call‐Parity.  Let’s refer to formula (CP.1) and make some rearrangements:  PV(F0,T) – Call(K, T) = ‐ Put(K, T) + PV(K)  Writing a “covered call” is equivalent to writing a put option and buying a zero‐coupon‐bond  for the amount K    ‐PV(F0,T) – Put(K, T) = ‐ Call(K, T) – PV(K)   Writing a “covered put” is equivalent to writing a call  option and taking out a loan of amount K. 

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