circuit breakers

 Rules created by the major stock exchanges and the SEC* to halt trading temporarily during periods of severe price fluctuations. These rules were created in response to BLACK MONDAY (1987), when the DJIA* fell over five hundred points in one day.
 ► “The halts were among a package of so-called circuit breakers that were implemented to slow panic-driven stampedes out of stocks after the 1987 market crash.” (Wall Street Journal, July 22, 1996, p. C1)

American business jargon. 2014.

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