I was wondering: what is the difference between trading 5 S&P emini contracts and one regular S&P contract? If I understand it right, 5 eminis are the same as one regular S&P contract...meaning a one point movement with 5 minis is $250, which is the same as a one point movement with regular. SO...why would some one choose to trade 5 minis over regular? I may be mistaken, but dont they both have about the same movement during the day (about same volatility?) Also...since most brokers charge per contract, would it not be more advantageous (commission-wise) to trade the one versus five? Did all of this make sense? Or am I just on the wrong track here?! Thanks!