Dent makes heavy use of charts, cycles, and trends apart from his demographic theories in predicting short and intermediate term economic and stock cycles. His work is primarily based on the assumption that most long term stock market performance can be explained by studying long term trends and charts from the past. His critics question the assumption that clues to all major stock market events can be found in the relatively short history of well functioning stock markets in the world. His work has also been criticized for heavy use of data dredging- where it is easy to find patterns in past data and assign predictive powers to them when many such patterns occur in every data collection purely by chance. Dent has also been criticized for being downright wrong on several of his predictions by many economists. In fact, www.maxfunds.com, a financial reporting site awarded him the The "Ultimate Charlatan" Award. They write: "The worst investing advice usually arrives near the top and bottom of stock market cycles. Demographic trends guru Harry S. Dent is making the rounds again, and touting his latest book, The Great Depression Ahead: How to Prosper in the Crash Following the Greatest Boom in History ... In his 2006 work, Dent predicted, “The Dow hitting 40,000 by the end of the decade, the NASDAQ advancing at least ten times from its October 2001 lows to around 13,500, and potentially as high as 20,000 by 2009…The Great Boom resurging into its final and strongest stage in 2007, and even more fully in 2008, lasting until late 2009 to early 2010.” ... Of course, those who read The Roaring 2000s, Dent's 1999 masterpiece, should soon be buying each of us a turkey with all the fixin's. According to the book, only a year remains before the Dow breaks 40,000 and the Nasdaq hits 20,000, at which time we'll simply amplify our fortunes by shorting stocks in the coming depression. We can’t underestimate how big this final move up will be before the depression kicks in, since The Dow and Nasdaq are currently quite a bit lower than they were back in 1999 when The Roaring 2000s was published."