lee,
"YM price will be 45 - 50 points higher than the cash."
Does Ym ever trade at discount to cash index?
Ym may trade below the cash index but that would most definitely put YM below the trigger point at which the arbitragers would initiate sell programs ... programs to sell stock and buy futures which, of course, would increase the futures price until it got back above the trigger point for sell programs. Conversely if YM increases above the fair value it will eventually hit the trigger for BUY programs and the arbitragers will buy stock and sell the futures until balance is restored once again near fair value for the futures contract.
Lee
Is there any site that lists Ym premium/discount data on real time?