Black Thursday The name given to Thursday, October 24, 1929, when the New York Stock Exchange plummeted, leading to the Great Depression of the 1930s. Investopedia Says: As a result of this day, the Securities Act of 1933 and the Securities Exchange Act of 1934 were formed in order to increase market regulation in the hope of preventing future catastrophic events. Related Terms: Black Monday Calendar Effect Fractional-Reserve Banking Great Depression Kondratiev Wave Securities And Exchange Commission - SEC |