Interactive brokers has total $5 commision for open and close 1 contract. So if I trade $5-sized djia then it`s equivalent of 1 point spread. If I trade $10 sized, then then it`s equivalent of 0,5 point spread.
So as I say, bid/ask difference (on cbot) is usually 2 points + commision.
I still don't understand why GFT has 8 points on djia fut. and only 2 points on djia spot.
Does really to hedge spot for bucket shop is much simple than to hedge futures?