Sometimes it changes. Lately we've been going away from Max Pain. My op-ex window opens tomorrow and runs through November 21. If it looks like we are going to be unable to reach 960 SPX, by my theory we would move a distance greater than the difference between tomorrow's high and 960 SPX.
For example, if we hit 870 SPX tomorrow but are still dumping, my theory would have us drop to at least 780 SPX by op-ex.
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