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Largest percentage fall on the Dow Jones Industrial Average in one day

Largest percentage fall on the Dow Jones Industrial Average in one day
Who
Dow Jones Industrial Average
What
22.61 percentage
Where
United States (New York,)
When
19 October 1987
The largest percentage decline in a day's trading on the New York Stock Exchange was 22.61 per cent when the Dow Jones Industrial Average, an index measuring conditions on the exchange, dropped 508 points on 19 October 1987 (Black Monday) to close at 1,738.74.