纽约证券交易所援引了很少使用的规则48，该规则“提供了交换，以暂停传播价格指示的要求，并在开放之前获得地板式批准，而当市场范围极高的波动性可能会导致交易所延迟开放证券。”
规则48旨在仅在那些情况下可能会通过阻碍公平和有序的证券开放来损害交易所的极端市场波动的潜力可能会损害交易所的地面运营。因此，该规则规定了在宣布这种情况之前要考虑的许多因素，包括：
*前一天的波动性trading session;
* Trading in foreign markets before the open;
* Substantial activity in the futures market before the open;
*开幕前的关注指标；
* Evidence of pre-opening significant order imbalances across the market;
* Government announcements;
*新闻和公司活动；和，
* Any such other market conditions that could impact floor-wide交易条件.
我知道这种很少使用的规则用于稳定熊牛油的市场' collapse in March of 2008.
Goes to show what kind of market we are operating in. With North/South Korea tensions, risk of contagion in Europe, and slowing in China/Australia, this is a volatile market indeed.
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