The decision isn't made real-time by actual people like I think you're suggesting. The rules are well-known and set in advance by the SEC and exchanges. In thi

The decision isn't made real-time by actual people like I think you're suggesting. The rules are well-known and set in advance by the SEC and exchanges. In this case it's SEC Rule 80B and NYSE Rule 7.12. You can read more about trading curbs here [0] and this one in particular here [1]. [0]: https://www.investopedia.com/terms/t/tradingcurb.asp https://www.investopedia.com/terms/t/tradingcurb.asp [1]: https://www.nyse.com/markets/nyse/trading-info https://www.nyse.com/markets/nyse/trading-info