Black-swans events are rare — hence the name — but when they happen they are sudden, awful and unpredictable. The U.S. stock ...

And there are a few reasons why. Black Monday is the term used for Oct. 19, 1987 — a day when the U.S. stock market suffered its largest single-day percentage loss ever. The Dow Jones Industrial ...

Some are referring to it as Black Monday, a reference to the day Wall Street crashed with the largest one-day stock market in history − dropping 22.6% on Oct. 19, 1987. Others are referring to ...