If you don't meet your margin call within 24 hours, we can sell some or all of the investments used to secure your loan. (wealth.anz.com)
When you can't meet a margin call because you have insufficient liquidity, that's profound. (businessinsider.com)
I haven't seen any news about increases, but the exchanges must be nervous about traders not being able to meet margin calls given the huge increase in volatility. (ibankcoin.com)