I'm not a fan of having memberships. I don't think there's any real benefit. The problem is not that the exchange needs additional capital to cover counterparty risk. The problem is that the exchange is not properly mitigating the counterparty risk. This hasn't been an issue for the past month because the market has been fairly stable. However, as soon as bitcoins move again (in either direction) this will become an issue again.
There are two points BoomerLu made which I think should be addressed ASAP:
paraphrase:
1) Forced liquidation regardless of win vs loss
2) Forced, immediate liquidation even in the case of small contract size (fractional contracts would help here)
The below puts a bit more color on these points, but it boils down to the two items above.
To put more color on it, it's not the exchange's role to decide who has "positive returns" or "negative returns" -- especially when deciding who to liquidate against. That's because more advanced traders will have more complicated positions on against multiple instruments. For a simple example, if I'm trading BUM3 against BUN3, then looking at the PNL of only one contract doesn't tell the whole story. Similarly, I may be involved in a trade using multiple exchanges, so icbit doesn't even have access to all the information it needs to determine my PNL.
The exchange's role is to maintain predictability of behavior. So, if someone has breached margin, *and* there are no orders to fill against in the market, then the only fair thing to do is liquidate evenly across all the existing open interest on the other side.
And, since that implies that the orderbook is empty, the execution price should be the worst-case scenario -- which is the maximum price movement for the session, on the empty side of the orderbook.
I think the above is clear and uncontraversially fair in terms of how to liqiudate positions. In the past, however, it wasn't achievable because positions
weren't liquidated in a timely manor. At times, there has been lag of 4+ sessions before a margin call occurred. The fallout is that prices moved so far in that time, that the member in bad standing didn't have enough capital to close out the position, and instead margin was taken from members in good standing.
That's unacceptable, but it is avoidable. The policy should be this:
1. Warning letters are sent when margin falls below 100% of initial margin. Members can post additional margin to be safe.
2. Positions are liquidated as soon as margin falls below 75% of initial margin. This is the current policy, but it turns out that the liquidation doesn't really occur.
We've spoken about this quite a bit over the past month or so, both in this forum, int he icbit chat, and in offline conversations.
Fireball, can you please summarize the current status with respect to the above, and what the plans are going forward?