Many investors like the idea of adding commodities to their portfolios to make them more diversified. Stocks, bonds, and many other popular asset classes often trade in lockstep with each other, making it harder to avoid downturns when conditions on Wall Street deteriorate. Commodities, on the other hand, typically behave in accordance with the supply and demand dynamics of their markets, and with each commodity having its own producers and consumers, you can get greater diversification by being smart about what you pick.However, commodities investing is a lot different from trading stocks.