30 years since major stock market drop known as "Black Monday"

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(CBS Newspath) -- Thursday, October 19, 2017 marks the 30-year anniversary of "Black Monday" -- October 19, 1987 -- when stock markets around the world plunged.

The Dow Jones Industrial Average fell 508 points -- marking a 22.6 percent drop.

Following the big fall, regulators put new rules into effect, allowing for a halt in trading when there are exceptionally large price drops in certain indexes.