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Binary Options : Vega
Issued on August 24 2011 par Calendarspread

Binary Options are sensible to implied volatility variations.
Binary Options are sensible to implied volatility as every option. It leads to the notion of vega.



I - Binary Option Vega

As for the majority of greeks, the vega is calculated as a derivative of an option price.
This time, with respect to implied volatility.

ν = ∂ Binary / ∂ σ

For a binary call :
ν ( binary call ) = ∂ exp(-rτ) . N(d2) / ∂ σ
ν ( binary call ) = - exp(-rτ) . N’(d2) . d1/σ

For a binary put :
ν ( binary put ) = ∂ exp(-rτ) .(1- N(d2)) / ∂ σ
ν ( binary put ) = exp(-rτ) . N’(d2) . d1/σ




II - Relation between Binary Options Vegas

ν ( binary call ) + ν ( binary put ) = - exp(-rτ) . N’(d2) . d1/σ + exp(-rτ) . N’(d2) . d1/σ = 0



III - Graphs

For a binary call 100:

For a binary put 100 :



Previous : Binary Option : Theta

Other Derivatives - INDEX
Other Derivatives - CHAPTER I
Other Derivatives - CHAPTER II
Other Derivatives - CHAPTER III
Other Derivatives - CHAPTER IV

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