Black Week is a phrase frequently used in the popular
press to mark periods of a few days When a string of similar
unfortunate events occur. Its celebrity usually fades to be
replaced by another Black Week a few years later. However, a few
Black Weeks have acquired an historical notoriety.
The week of October 6th is referred to as the black week as the
Dow Jones fell 18% in a single week. The Dow also closed 5 out of 5
sessions lower.