Nelson: R59:
I just did some calculations and discovered the same thing. I hadn't noticed it before. I'm surprised how "sloppy" it tracks. It sure seems like you could consistently play it on the extremes. If you had enough money and didn't need to care about costs, you could short the one and go long the other whenever they diverged. (Of course, I'm not sure if you can short the QID.)
Nice observation.
Len
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