|From Gurufocus.com: There is no discounted cash flow method for commodities. They don't pay dividends or bear interest rates; they don't generate cash. Long-term investing in commodities is all about finding opportunities where supply and demand are out of balance and the price is low relative to where it "should" be on an inflation adjusted basis.
With no external forces acting on a commodity price (ie., supply and demand are in balance and the currency doesn't change), commodities prices would move in lockstep with inflation. A 3% increase in inflation would result in a 3% increase in commodities prices.......Full Article: Source