Explained to a learner in my DMs who underestimates the vega risk of a near dated option: It's true that the near term option's vega is not large. But that is counterbalanced by the fact that near term IVs move faster (ie are more volatility then longer term IVs)
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A 1 month ATM option has 1/2 the vega of a 4 month option. But if the 1 month IV is twice as volatile it's the same vega risk. Need to consider vega and the vol of vol.
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(This is a doorway to a whole discussion about term structure and vega scaling but I'm not running down that stuff anytime soon...maybe
@AgustinLebron3,@Ksidiii, or@volmagorov can thread one while sitting on a toilet)4 replies 1 retweet 28 likesShow this thread -
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Replying to @volmagorov @KrisAbdelmessih and
It’s a long time since I traded any vol but I think we looked at “adjusted vega” ie vega divided by sqrt of time to expiry. Ring any bells?
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Replying to @macrocephalopod @volmagorov and
sounds like an adjustment to annualize the risk. only works though if the stdv of p&l is the same for long and short maturities
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Replying to @mpp75214 @macrocephalopod and
I think it's more about normalisation of the vol risk as you'd expect the Vol move to decrease with time in a 1/sqrt(t) manner
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