Thirty years ago investors were stunned as global stock markets collapsed like a chain of dominos.
The day became known as Black Monday as months and years of share price rises were reversed in a single day of trading.
One dealer recalls being so stunned "jaws were hitting the desk".
In August 1987, every major US index hit record highs. But in Autumn of that year investors began selling - and - by October, at a rapid rate.
