What is the biggest weekly move for the Dow? Although it moves in 2 hours, on a weekly basis, returns tend not to be 2 hour moves times 4 times 7. i.e. the market spends time retracing.
Buying the Dow on Dec 21, and selling on Jan 7, has been a loser in 3 of the last 4 years... Though it was a winner every year from 1997-2003...
Also, for the last 10 years, the average loss for the Dow (basis the March futures) in the month of January was -188 pts...