David Rosenberg notes that 94% of the S&P's performance in 2010 was amassed during the first...

|By:, SA News Editor

David Rosenberg notes that 94% of the S&P's performance in 2010 was amassed during the first trading day of each month. "And what do you know? 2011 started with a 1.1% pop and has sputtered since." The lesson: "Go long at closing on the last trading session of any given month, hold long through next day's closing, and short the remainder of the month."