Stock Market Crash of 1929, Economic event in the U.S. that precipitated the Great Depression. The U.S. stock market expanded rapidly in the late 1920s and reached a peak in August 1929, when prices began to decline while speculation increased. On October 18 the stock market began to fall precipitously. On the first day of real panic, October 24, known as “Black Thursday,” a record 12,894,650 shares were traded. Banks and investment companies bought large blocks of stock to stem the panic, but on October 29, “Black Tuesday,” 16 million shares were traded and prices collapsed. The crash began a 10-year economic slump that affected all the Western industrialized countries.
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