Sure, markets fell a tad today. But to us, the "what" of market action is never as interesting as the "why," and given that today was options expiration, we can't help but think of one word: gamma . Adam posted some nice thoughts about gamma yesterday ( 1 , 2 ), and he even seems a little prescient with remarks like this: …another important point to note about gamma on Expiration Week is that it tends to feed on itself and keep a body in motion
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