The 1929 Wall Street Crash and the Great Depression
How Black Thursday destroyed billions of dollars and sank the global economy for a decade
The most devastating financial collapse of the 20th century: the 1929 crash wiped out 90% of Wall Street's value in three years and plunged the entire world into an unprecedented economic depression.
The Roaring Twenties: The Prelude to Disaster
The 1920s were a period of unprecedented economic euphoria in the United States. Industrial production had exploded, automobiles were multiplying, and radio and electricity were changing daily life. The Dow Jones Industrial Average had risen from 63 points in 1921 to 381 points in September 1929—a gain of 604% in eight years.
However, this growth had deeply concerning characteristics:
- Buying stocks on margin (with 10:1 leverage) had become common practice
- Investment trusts (the ancestors of modern funds) were multiplying with leverage upon leverage
- Many companies had valuations disconnected from real earnings
- The Federal Reserve had kept interest rates too low for too long
The Crash: The Fatal Days
Thursday, October 24, 1929 — 'Black Thursday': Prices began to give way from the opening bell. Panic spread within minutes: 12.9 million shares traded in a single day (an all-time record). In the afternoon, a consortium of banks led by JP Morgan intervened by buying stocks to stabilize the market. The closing was only -2%, but panic was already widespread.
Monday, October 28 — 'Black Monday': The market opened sharply lower again. No banking consortium intervened this time. The Dow lost 12.8% in a single day.
Tuesday, October 29 — 'Black Tuesday': The most devastating day in American financial history up to that point. 16 million shares traded, and the Dow lost another 11.7%. Many brokers could not find buyers at any price.
The Spiral of the Depression (1929–1933)
The Wall Street crash was only the beginning. The Great Depression that followed was caused by a series of flawed economic policies:
- Smoot-Hawley Tariff Act (1930): extremely high customs duties that triggered a global trade war
- Monetary contraction: the Fed allowed thousands of banks to collapse without intervening
- Deflationary spiral: prices fell, people postponed purchases, and companies closed
The Numbers of the Depression:
- Dow Jones: from 381 to 41 points (-89% in 3 years)
- US Unemployment: from 3% to 25%
- US GDP: -30%
- 9,000 banks failed
- 15 million Americans unemployed
Roosevelt's New Deal
In 1933, Franklin D. Roosevelt inaugurated the New Deal: a program of massive state intervention in the economy. The Glass-Steagall Act separated commercial from investment banking, the SEC was created to regulate markets, and federal work programs provided employment for millions of jobless citizens.
The Dow Jones did not recover its 1929 levels until 1954 — 25 years later.
Enduring Lessons
- Leverage amplifies cycles: buying on margin without control turns corrections into catastrophes
- Economic policies matter: the wrong decisions post-crash turned a recession into a depression
- Market regulation is necessary: the SEC was born out of this very disaster
- Markets can remain irrational for a long time: 25 years to recover the highs