"We are going to see economic times the likes of which no living person has seen," Trends Research Institute Director Gerald Celente said, forecasting a "Panic of 2008."
"The bigger they are, the harder they'll fall," he said in an interview with New York's Hudson Valley Business Journal.
Celente -- who forecast the subprime mortgage financial crisis and the dollar's decline a year ago and gold's current rise in May -- told the newspaper the subprime mortgage meltdown was just the first "small, high-risk segment of the market" to collapse.
Derivative dealers, hedge funds, buyout firms and other market players will also unravel, he said.
He said he would not "be surprised if giants tumble to their deaths," Celente said.
The Panic of 2008 will lead to a lower U.S. standard of living, he said.
A result will be a drop in holiday spending a year from now, followed by a permanent end of the "retail holiday frenzy" that has driven the U.S. economy since the 1940s, he said.