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Rule 80B |
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Rule 80B A rule on the New York Stock Exchange mandating that trades stop for a certain amount of time if the Dow Jones Industrial Average falls 10%, 20%, or 30% in a single trading day. This measure is designed to prevent panic selling by stopping trading after a security or an index has fallen by a certain amount. For example, if the Dow Jones Industrial Average falls 10% in a trading day, the New York Stock Exchange suspends trade for at least one hour. Rule 80B is intended to allow investors to determine whether a situation is really as bad as it looks. See also: Suspended trading, collar.
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