barjon
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..............So - I see A go up, I buy B... what happens if I buy B and A then goes down the sh1tter?..........
toastie
well, you just buy B and sell A to start with (or immediately your buy B goes red) on the basis that the correlation will correct either by B rising faster than A or it (B) falling more slowly than A. Do it all the time with ftse/dow.