The Wall Street Crash of 1929 began in late October 1929 and led to the Great Depression. Stock prices had been rising rapidly in the late 1920s as companies prospered in the post-WWI economic boom. However, overproduction led to falling profits, and investors began selling off their shares, causing prices to plummet. This triggered widespread panic selling and the crash, with stock prices falling over 20% in two days. The crash had devastating consequences as banks and companies failed, unemployment rose over 20 million, and the US economy severely contracted for years.