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).
Not saying I believe in it but I thought the theory was reasonably straightforward? Like, if dealers are long vanna then increasing vol means their delta goes up so they sell shares to hedge, decreasing vol means they buy shares. Vice versa if they are short vanna.
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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.
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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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