The Great Crash of 1929: How the Euphoria of the '20s Turned into the Great Depression
The anatomy of the most devastating financial collapse of the 20th century — and the lessons we still ignore
On October 24, 1929 — 'Black Thursday' — the American stock market began the collapse that would wipe out 89% of its value over the next three years and trigger the Great Depression.
The Roaring Twenties
The 1920s were an era of unprecedented euphoria. New technologies — radio, automobiles, aviation — seemed to promise endless growth. Wall Street reflected this optimism: the Dow Jones rose from 63 points in 1921 to 381 in September 1929 — a 500% rally in 8 years.
Leverage and Speculation
The amplifying factor was credit. Investors bought stocks on 10% margin — meaning they could control 100 dollars' worth of stock with only 10 dollars. When prices collapsed, margin calls triggered cascading forced liquidations.
The Crash
On October 24, 1929 (Black Thursday), 13 million shares changed hands in a panic. On October 28-29 (Black Monday and Black Tuesday), the Dow lost 23% in two days. By 1932, it had lost 89% from its highs.
Lessons
- Financial leverage amplifies crashes: buying with 90% margin is a recipe for systemic disaster.
- The optimism of the years preceding a crash is part of the pattern: 'this time it's different' is the most dangerous phrase in finance.
- Stock market crashes spill over into the real economy: they are not isolated events within the markets.