Invest in commodities themselves rather than commodity stocks

Jim Rogers : .....I just remember in the '70s stocks went down and did nothing or economies did nothing and yet commodities themselves went through the roof. some commodity stocks, of course, did well in the '70s, but yale did a study recently showing you would have made 300% more investing in commodities themselves rather than commodity stocks so I'm sticking with the real commodities. - in CNBC