For a derivative of an asset that follows standard geometric Brownian motion, it may be useful to find the sensitivity of the derivative price with respect to a parameter of the underlying process. In particular, for the parameter \(\sigma\) the corresponding sensitivity is termed vega and is

For a call option on stock that follows geometric Brownian motion there holds \(\mathcal{V}=S \sqrt{T} N^{\prime}\left(d_{1}\right)\), where \(d_{1}\) is given by equation \((15.16 b)\). What is vega for the corresponding put option?

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V = af (S,t)