'Studies show, in my experience, that commodities themselves outperform commodity stocks. In the ‘70s, oil prices went up 10 times; commodity oil stocks did nothing. With stocks you have to worry about the management and the balance sheet—a hundred things. Commodities are pretty dumb: If there's too much oil, the price is going to go down; if there's too little, it's going to go up,' says legendary global commodities investor Jim Rogers.