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A stock market is the aggregation of buyers and sellers of shares that represent ownership in businesses, encompassing both publicly listed securities and privately traded equity. Crashes are sudden, dramatic declines of stock prices across a broad market, typically defined as drops of over 10% in an index over several days, and are driven by panic selling, leverage, and external economic events. Historical crashes such as those in 1929, 1987, and earlier episodes like the Panic of 1907 illustrate how rapid price declines can trigger widespread financial disruption, though they do not always lead to prolonged bear markets.
A stock market crash is commonly defined as a decline of over 10% in a market index over a few days, often accompanied by panic selling and leverage.
Crashes frequently follow periods of prolonged price rises, high optimism, and extensive use of margin debt.
Major historical crashes include the 1929 Wall Street crash, the 1987 Black Monday, and the 1907 panic, each linked to specific economic and psychological factors.
Global stock market capitalization grew from US$2.5 trillion in 1980 to US$111 trillion by the end of 2023.
The United States accounts for about 59.9% of global market capitalization, making it the largest stock market by country.
A crash is typically a drop of over 10% in a stock market index over several days, characterized by panic selling and often linked to high leverage and economic shocks.
The 1929 crash led to a 40% drop in the Dow Jones index by November and ultimately contributed to the Great Depression, with the index losing 89% of its value before bottoming in 1932.
On October 19, 1987, the Dow Jones Industrial Average fell 508 points, a 22.6% decline in one day, while the S&P 500 dropped 20.4%.
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