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Gamma Г and Vega υ Relationship
Issued on October 27 2010 par Strategies Options

This is another relation between option sensitivities. Gamma - Vega Relationship.
It's possible to express option sensitivities as a combination of each others if interest rates are zero in the Black & Scholes economy.




I - Gamma and Vega

One is able to link Gamma with Vega :

Vega = Γ . σ . S² . T

Γ = option gamma
σ = annualized volatility
S = lspot
T = maturity


This relationship is extremelly useful to grasp the link between implied volatility and historical one.



II - Consequences :

The previous relation can be written as:

Vega / (Γ . T) = cst

It leads to an interesting formula if one integrates from time 0 to T, something as Vega as an integral of gamma.




Next: Black & Scholes : A First Attempt
Previous: Time And Volatility Equivalence

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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