In five weeks in 1929, the stock market lost 40% of its value — and by 1932 the Dow had fallen 89%. A decade of bread lines, mass unemployment, and global despair followed.
The crash didn't arrive without warning. Throughout the late 1920s, stocks had been climbing on a wave of speculation and easy credit — ordinary Americans buying shares they didn't understand with money they had borrowed. By September 1929, the Dow Jones Industrial Average had reached an all-time high of 381.17, fueled by optimism that the boom would never end.
The first tremor struck on 'Black Thursday,' October 24, 1929, when the market opened with a terrifying 11% drop. A group of powerful bankers — including representatives of JP Morgan — pooled their resources and began buying blue-chip stocks at above-market prices to halt the panic. It worked temporarily, but it was only a patch over a burst dam.
Black Tuesday, October 29, 1929, was the true catastrophe. A record 16.4 million shares traded hands as prices collapsed. Fortunes evaporated in hours. The ticker tape fell so far behind the actual trading that investors couldn't even track how much they were losing in real time.
From its September 1929 peak to its trough in July 1932, the Dow Jones fell 89.2% — a loss it would not fully recover from until 1954. Thousands of banks failed, wiping out the savings of millions of ordinary Americans who had never owned a single share of stock.
The Great Depression that followed lasted over a decade. By 1933, unemployment in the United States had reached 25%. Similar devastation rippled across Europe, destabilizing governments and creating the conditions of desperation that brought Adolf Hitler to power in Germany.
Congress responded with landmark legislation. The Glass-Steagall Act of 1933 forced banks to separate their commercial and investment activities — a wall between savings accounts and speculative trading that stood for 66 years until it was repealed in 1999. The Securities and Exchange Commission (SEC) was also created to regulate the market and prevent the fraud and manipulation that had contributed to the crash.
The crash exposed just how reckless the speculation had been. Companies were wildly overvalued, investors were borrowing on thin margins, and regulatory oversight was almost nonexistent. One popular investment vehicle of the era — the 'investment trust' — allowed investors to borrow money to buy shares in companies that themselves borrowed money to buy shares in other companies, creating layers of leverage that collapsed like dominoes.