A stock marketing crash is a sudden sharp drop in stock prices across a majority of the stock market. The extreme rise in the Dow Jones in the period 1920 – 1929 and especially between 1927 – 1929, was primarily caused because the expected value of the shares of companies that are in the acceleration phase of their existence, was increasing enormously.

When we see the big number of shares (big volume) is changing hands during the crash it tell us that the number of panic sellers is dramatically reduced (their demands are satisfied – they sold) which may lead to the shift in the supply/demands balance.

The days surrounding the stock market crash of 1929 were especially painful for investors who had borrowed money to purchase stocks that had become worthless or close to it. The situation influenced what became a major turning point for the American economy because many of these borrowers, who had leveraged themselves considerably in an effort to participate in the bull market , were ruined financially.

Research at the Massachusetts Institute of Technology shows that there is evidence that the frequency of stock market crashes follow an inverse cubic power law.24 This and other studies suggest that stock market crashes are a sign of self-organized criticality in financial markets.

Besides the dramatic effect on investor psychology, the stock market crash of 1929 contributed to the creation of a variety of new laws, organizations and programs designed to improve the country’s infrastructure, further social welfare and prevent corporate fraud and abuses.