Some stocks depend on commodity prices for their success – or failure – and the main ones that come to mind may be inside the energy sector. If Warren Buffett chooses to buy an oil company, as he did through a nine-day buying streak in shares of Occidental Petroleum Co. NYSE: OXY, it may be because he sees a fundamental reason for oil prices to move higher and bring the company’s valuation up with it.Today, investors can step outside the most commonly watched commodities, such as oil and precious metals. Wh ...