CHAPTER 8Volgamma, Butterfly, and Kurtosis
We began our study of smile in the previous chapter. This chapter extends our understanding of smile via study of three closely related ideas, namely volgamma, butterfly, and kurtosis.
Volgamma Volgamma describes how the 
of an option varies with 
. Its definition is
Recall from Equation (5.3) that 
is independent of 
for an ATM option and hence its volgamma is zero. However, I show ahead that a long position in an OTM option is long volgamma.
From the previous definition we see that a trader with a long volgamma position, 
, derives longer 
when 
rises. If she wishes to return her to its previous level, then she can sell options. She may be ...
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