both on the down side ... and the up side ... for all futures contracts ... not just equity indices ... been there for decades ...
Yeah - I knew they had them on the regular markets. I just figured the futures were always speculative and not as reigned in. Makes sense though.
>>been there for decades<<
Yes, it’s there so that brokers can collect additional margin every day when people are caught in losing trades.
I believe silver once went limit down each day for a couple of weeks in early 1980 when the Hunt brothers were forced to liquidate their position. Actual silver went from $20 to $10 in one day and it took several days of limit down futures moves to catch up, as I recall.