view archival footage of the impoverished American population in the aftermath of the stock market crash of 1929 “The unemployed, the soup kitchens, the grinding poverty, and the despair”—the worldwide consequences of the Great Depression, from The Second World War: Prelude to Conflict (1963), a documentary by Encyclopædia Britannica Educational Corporation. Encyclopædia Britannica, Inc. See all videos for this article

Stock market crash of 1929, also called the Great Crash, a sharp decline in U.S. stock market values in 1929 that contributed to the Great Depression of the 1930s. The Great Depression lasted approximately 10 years and affected both industrialized and nonindustrialized countries in many parts of the world.

Crowds gathering outside the New York Stock Exchange on Black Thursday, Oct. 24, 1929. Stapleton Historical Collection/Heritage-Images/Imagestate

Top Questions What was the Wall Street crash of 1929? The Wall Street crash of 1929, also called the Great Crash, was a sudden and steep decline in stock prices in the United States in late October of that year. Over the course of four business days—Black Thursday (October 24) through Black Tuesday (October 29)—the Dow Jones Industrial Average dropped from 305.85 points to 230.07 points, representing a decrease in stock prices of 25 percent. Why did the Wall Street crash of 1929 happen? The main cause of the crash was the long period of speculation that preceded it, during which millions of people invested their savings or borrowed money to buy stocks, pushing prices to unsustainable levels. Other causes included an increase in interest rates by the Federal Reserve in August 1929 and a mild recession earlier that summer, both of which contributed to gradual declines in stock prices in September and October, eventually leading investors to panic. What happened in the Wall Street crash of 1929? From Black Thursday (October 24), which is generally treated as the beginning of the crash, through Black Tuesday (October 29) stock prices declined by 25 percent, as measured by the Dow Jones Industrial Average, which dropped from 305.85 points to 230.07 points.

During the mid- to late 1920s, the stock market in the United States underwent rapid expansion. It continued for the first six months following President Herbert Hoover’s inauguration in January 1929. The prices of stocks soared to fantastic heights in the great “Hoover bull market,” and the public, from banking and industrial magnates to chauffeurs and cooks, rushed to brokers to invest their liquid assets or their savings in securities, which they could sell at a profit. Billions of dollars were drawn from the banks into Wall Street for brokers’ loans to carry margin accounts. The spectacles of the South Sea Bubble and the Mississippi Bubble had returned. People sold their Liberty Bonds and mortgaged their homes to pour their cash into the stock market. In the midsummer of 1929 some 300 million shares of stock were being carried on margin, pushing the Dow Jones Industrial Average to a peak of 381 points in September. Any warnings of the precarious foundations of this financial house of cards went unheeded.

View of the New York Stock Exchange on an active day in the late 1920s. Share prices peaked in August 1929 before falling rapidly in October of the same year. Library of Congress, Washington, D.C.

Prices began to decline in September and early October, but speculation continued, fueled in many cases by individuals who had borrowed money to buy shares—a practice that could be sustained only as long as stock prices continued rising. On October 18 the market went into a free fall, and the wild rush to buy stocks gave way to an equally wild rush to sell. The first day of real panic, October 24, is known as Black Thursday; on that day a record 12.9 million shares were traded as investors rushed to salvage their losses. Still, the Dow closed down only six points after a number of major banks and investment companies bought up great blocks of stock in a successful effort to stem the panic that day. Their attempts, however, ultimately failed to shore up the market.

The panic began again on Black Monday (October 28), with the market closing down 12.8 percent. On Black Tuesday (October 29) more than 16 million shares were traded. The Dow lost another 12 percent and closed at 198—a drop of 183 points in less than two months. Prime securities tumbled like the issues of bogus gold mines. General Electric fell from 396 on September 3 to 210 on October 29. American Telephone and Telegraph dropped 100 points. DuPont fell from a summer high of 217 to 80, United States Steel from 261 to 166, Delaware and Hudson from 224 to 141, and Radio Corporation of America (RCA) common stock from 505 to 26. Political and financial leaders at first affected to treat the matter as a mere spasm in the market, vying with one another in reassuring statements. President Hoover and Treasury Secretary Andrew W. Mellon led the way with optimistic predictions that business was “fundamentally sound” and that a great revival of prosperity was “just around the corner.” Although the Dow nearly reached the 300 mark again in 1930, it sank rapidly in May 1930. Another 20 years would pass before the Dow regained enough momentum to surpass the 200-point level.

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Many factors likely contributed to the collapse of the stock market. Among the more prominent causes were the period of rampant speculation (those who had bought stocks on margin not only lost the value of their investment, they also owed money to the entities that had granted the loans for the stock purchases), tightening of credit by the Federal Reserve (in August 1929 the discount rate was raised from 5 percent to 6 percent), the proliferation of holding companies and investment trusts (which tended to create debt), a multitude of large bank loans that could not be liquidated, and an economic recession that had begun earlier in the summer.