Today was Black Tuesday, the biggest stock market crash in history.

16,410,030 shares were traded in a single day. The machinery used to compute sales could not cope with the business.

It followed Black Monday a day earlier, and last week there was a Black Thursday. It doesn't get much blacker than that...

The Great Depression followed.

The crash followed a long period of massive over-speculation in the US market. The market had actually peaked in August.

By 1932 stock prices were still only about 20% of their 1929 highs.