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can you explain the mark price of MOVE v last traded price? Would mark be the actual movement that day?

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Mark price is the mid of (bid, ask, last).

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between these pics and my reply i don’t get it sorry

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E.g. right now bid is 125.50, ask is 127.50, and last is 126.75, so mark price is the middle of those--126.75

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I understand but why is mark saying 117