Futures usually lead cash as they offer quicker, leveraged exposure, but not always. So if we get a cash rally that drags the futures up you can see what you saw this afternoon. Big changes in interest rates and component stock dividends during the day can impact FV.
Like steve, I do not use this tool yet either. I do watch for one thing which Mak alluded to by calling it an arbitrage meter. The arbs don't make directional bets. They wait for the relationship to get out of line and buy one / short the other. So they throw an equal amout of money at both sides which can often be seen as a volume spike. One side has to give up ground and come back in line thus exposing themselves as the weaker side.
Like steve, I do not use this tool yet either. I do watch for one thing which Mak alluded to by calling it an arbitrage meter. The arbs don't make directional bets. They wait for the relationship to get out of line and buy one / short the other. So they throw an equal amout of money at both sides which can often be seen as a volume spike. One side has to give up ground and come back in line thus exposing themselves as the weaker side.
