The United States experienced its largest one-year stock-market decline of the Great Depression era in 1931.
Using the Dow Jones Industrial Average’s annual performance, 1931 was the worst year of the early-1930s collapse, with a decline of roughly 52 percent. The fall came after the initial Wall Street crash of 1929 and reflected a deepening economic and financial crisis rather than a single trading day.
Bank failures, deflation, falling industrial production, and international debt problems all weakened confidence. The collapse of Austria’s Creditanstalt in May 1931 intensified international banking fears, while Britain abandoned the gold standard in September. These developments placed additional pressure on currencies, banks, and equities.
The 1931 figure is often confused with 1929, the year most closely associated with the beginning of the Great Depression’s stock-market crash. The Dow also fell substantially in 1930 and 1932, but the annual percentage loss was greatest in 1931. Stock-market performance alone does not measure the entire depression, whose unemployment and production effects extended for years.