OK - this is interesting - I gotta think about this one for a while .....
I have been looking at taking advantage of gaps on open as a single 'once per day' event
thanks for the feedback and the food for additional thought
Well every single gap down in the S&P will always eventually get filled - but you can also just buy any single downtick in the S&P and history says you'll eventually make money, really useless strategy to assume gaps always fill.
