Bruce Greenwald, a professor who heads Columbia Business School's value-investing program, says it's dumb for individual investors to own commodities directly.

FORBES: Magazine Article

Panelists included Charles Brandes of Brandes Investment Partners, Jan Hummel of Paradigm Capital, David Winters of Wintergreen Advisors, and Professors Bruce Greenwald and Tano Santos of the Columbia Business School.

FORBES: Some Closer than Others: Inside The Berkshire Hathaway Annual Meeting