Dow Could Tumble to 5,000

5:20 AM ET Tue, 24 Aug 2010

�If you look at the American stock market for the last 100 years�the markets appreciate in the average of 8-9 percent in the long term. The problem started in the 80s and 90s when the markets appreciate more than 8-9percent,� Charles Nenner from Charles Nenner Research told CNBC.