The well-known weekend effect has been reversing in Major U.S. indices from late 1980s to late 1990s. The correlation between Monday and Friday returns also exhibited a declining trend, and fluctuated around zero in the 1990s. A power ratio method is developed to measure consistently the...

The September 11, 2001 terrorist attacks created a unique situation where patriotism became a significant motive for companies to make stock buyback announcements. Officials from the stock markets and the SEC encouraged stock repurchase announcements to help stabilize the markets. However, some...

Autocorrelation in daily returns of the Dow 30 Index fluctuates significantly over time and reveals a declining trend after World War II. The relation between autocorrelation and volatility is negative and nonlinear. The relation between autocorrelation and volume is also negative and nonlinear....