Yes, this is my conclusion too - in fact all longer-dated longs move less than the weeklies, so that's always something to bear in mind, but shorter dated longs less
And every time I buy LEAPS when the SP is low, I sell calls against them and then the SP rockets and I miss out what could have been considerable profits, so change of tack from now on - will also buy LEAPS if the SP dumps (although I'm more inclined to take shares if I have the funds), but if I do sell against them, sell literally for beer money
Edit: I see a trend today...
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