Which stock exchange recorded a 45.8% fall during the global market crash of October 19, 1987?

The Hong Kong Stock Exchange recorded a 45.8% fall during the global market crash of October 19, 1987.

The collapse began amid worldwide concern about high valuations, interest rates, trade tensions, and the possibility that computerized trading strategies were intensifying losses. Hong Kong was especially severely affected, and its market’s decline was much larger in percentage terms than the Dow Jones Industrial Average’s 22.6 percent fall.

The shock spread across time zones. European markets experienced large losses, and the United States then suffered its steepest one-day percentage decline in Dow history. The sequence showed how increasingly connected financial markets had become, even before the internet transformed trading.

The Hong Kong figure is often associated with the Hang Seng Index, the principal share index used to describe the market’s performance. The Hong Kong Stock Exchange is the exchange; the Hang Seng is the index, so they should not be treated as interchangeable answers.