Investopedia explains 'Fast Market Rule'
Fast markets are rare and are triggered by highly unusual circumstances. For example, the London Stock Exchange declared a fast market on July 7, 2005, after the city experienced a terrorist attack. Share prices were falling dramatically and trading was exceptionally heavy.
The fast market rule is made possible because circuit breakers are not used. Circuit breakers allow exchanges to temporarily halt trading during sharp price declines to prevent panic selling. With a circuit breaker, the sharper the decline, the longer trading is halted.
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