The Dow Jones industrial average would have to fall 1,100 points in a day to trigger the first halt. If that point is reached before 2 p.m., the market would shut down for an hour. If the threshold is breached between 2 p.m. and 2:30 p.m., the halt will last 30 minutes. No trading stops will take place if the plunge occurs after 2:30 p.m.
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