Quote from jimrockford:
No, you just don't understand my reasoning. Go back and read it again.
Your reasoning is flawed. Margin requirements have always been based on current or historic volatility. Never on "what if"-scenarios. Otherwise we are all trading scared money.
Margin for YM is currently 3125. Or we going to see a 625 drop in a single day? Perhaps. Or we going to see it happen in less than an hour? Very unlikely. Is it going to plunge in a minute? Ridiculous. So unless IB's margin liquidation software is malfunctioning...