Can someone explain the "vanna decay" story? I am looking for something at least somewhat logically consistent (not even asking for a model cause I gave up on that).
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So long vanna positions are inherently destabilising for negatively skewed assets (since increasing vol normally goes along with share price falling) and short vanna is stabilising. Vice versa for positively skewed assets.
I don’t think anyone claims that the dynamic is the primary cause of moves in the underlying, rather than the hedging either suppresses or exacerbates moves that happen for some other reason.
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Possibly you are asking about something else since you used the phrase “vanna decay” which I am not familiar with?
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People refer to this stuff as “gamma hedging” or “vanna hedging” which is very unhelpful, since no gamma or vanna exposure is being hedged. It’s just sensitivities of delta to moves in spot or implied volatility.
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