The Wall Street crash of 1929 was the most devastating stock market collapse in United States history and a defining symbol of the economic crisis that followed. It emerged from the speculative boom of the “Roaring Twenties,” when industrial profits, easy credit, and public enthusiasm pushed share prices far above the underlying value of many companies.
The boom concealed serious weaknesses. Farmers faced overproduction, falling prices, and growing debt. Consumer-goods manufacturers produced more than low-wage consumers could buy. Steel production, construction, automobile sales, and other indicators weakened during 1929, while investors continued purchasing stocks. Brokers commonly lent small investors more than two-thirds of a stock’s value, creating enormous exposure to margin calls.
The Dow Jones Industrial Average peaked at 381.17 on September 3. After warnings and early declines, selling accelerated. On Black Thursday, October 24, 12.9 million shares were traded, and delayed ticker reports left investors unaware of current prices. Bankers temporarily slowed the fall by placing above-market bids on leading stocks. The recovery did not last. Black Monday brought a record Dow loss, and Black Tuesday saw about 16.4 million shares traded and approximately $14 billion in stock value erased.
The market continued falling until July 8, 1932, when the Dow stood at 41.22—an 89.2% decline from its 1929 peak. Banks and businesses failed in large numbers, credit contracted, and uncertainty reduced consumption and investment. The crash spread rapidly through interconnected global financial markets, contributing to unrest and unemployment in Europe.
Congress established the Pecora Commission and passed the Glass–Steagall Act, the Securities Act, and the Securities Exchange Act. Historians remain divided over whether the crash itself caused the Great Depression or whether banking failures and wider economic problems made the downturn catastrophic.