Definition of Black MondayBlack Monday: One of the two Mondays on which the two largest stock market crashes occurred in this century. The original Wall Street Crash occurred on Monday 28th October 1929, when the Dow Jones Industrial Average fell by 13%. On Monday, 19th October 1987, the Dow Jones average lost 23%. In both cases Black Monday in the USA triggered heavy stock market falls around the world, including in London. See our full Online Financial Glossary |
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