Berkshire follows the Benjamin Graham School of value investing, which looks for securities whose prices are unjustifiably low based on their intrinsic worth. Rather than focus supply and demand intricacies of the stock market, the company looks at companies as a whole. Some of the factors it considers are company performance, company debt, and profit margins. Other important investment factors for value investors like Berkshire Hathaway include whether companies are public, how reliant they are on commodities, and how cheap they are.