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Call Put Symmetry #2
Issued on September 10 2010 par Strategies-options.com

An obvious application : ATMF Options
We had seen that if the volatility smile is symmetric :

C ( S, X , T , r , q , σ) = ( X / ( S . exp ( ( r - q ) . T ) ) ) . P ( S , ( S . exp ( ( r - q ) . T ) ) ² / X , T , r , q , σ )


Obviously if,

X = ( S . exp ( ( r - q ) . T ) ) the strike equalizes the forward

It leads to :
C ( S, X , T , r , q , σ) = ( X / X) . P ( S , ( X ² / X) , T , r , q , σ )

Hence
C ( S, X , T , r , q , σ) = P ( S , X , T , r , q , σ )


Call and put have the same value.



Next : At The Money Forward Relationships 1
Previous : Call Put Symmetry


Relationships Between Option Sensitivities - INDEXRelationships Between Option Sensitivities - CHAPTER I
Relationships Between Option Sensitivities - CHAPTER II
Relationships Between Option Sensitivities - CHAPTER III

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