One day of panic ended the Roaring Twenties.

On October 29, 1929, sellers flooded the New York Stock Exchange. About 16 million shares changed hands, and prices collapsed as investors tried to get out at any price. Many had bought stocks with borrowed money during the boom, so the losses spread fast.

Black Tuesday followed days of sliding prices, and it became the symbol of the crash that helped open the Great Depression, a slump that lasted about a decade and reached far beyond the United States.

The shock later shaped banking rules and how governments respond to financial crises.

Which lessons from 1929 do you think still matter for the economy today?

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