I'm very new to this so I limit myself using cash index. This limits my number of contracts too. Andy Smith brought up this point a while ago. You can search his name and posts to get more info.
Quote from osho67:
I am glad to see someone is using IB.
Would you not get favourable margin if you do spread trading on some futures index? like ER2 ? Margin requirements on index options is very high. Your comments appreciated.
