On this day in October 1929 the world watched as Wall Street investors traded some 16 million shares on the New York Exchange in a single day.
Billions of dollars were lost, investors wiped out, and the day labelled Black Tuesday.
The aftermath was the Great Depression - which lasted from 1929 until 1939.
Malcolm McKinnen is an historian based in Wellington, who is an expert in this topic.
The Wall Street crash of 1929 Photo: Wikicommons
