Hi
A margin call occurs when your margin exceeds your net value (Equity with Loan Value).
A margin call occurs when the margin exceeds the Equity with Loan Value, but the ELV is not the same as the Net liquidation value.
If you sell a box, the cash that you received goes to the ELV but the value of the options doesn't, if they are american . And that difference makes your account have
an Excess liquidity, which you can use to margin other positions. I am correct ?
Equity with loan = cash value + stock value +bond + fund + european and asian options.
Excess liquidity = ELV - margin
Each leg of the box is marked independently, and since the spreads could be quite wide it's possible that the sum of the parts will be quite far from the fair value of the box spread.
Thanks , that was what I wanted to confirm.
But, following your example, if the mark to market value of the box changes momentarily, that wouldn't change the margin required, or maybe yes, but not from 300.00 to 300,000.00 . Remember We have a big exccess liquidity from that box.
If a SPX 1000 points box goes to 1050, that will be arbitradged very quickly, doesn't ? and return to a fair value.
And more, if it's a box with european style options, no early assignment risk, the broker knows exactly what you are going to lose at expiration day, so would not be fair to early autoliquidate that box for a biger loss. Someone has found in a similar situation ?
Thank you for your comments.