"He pointed to Chesapeake Energy, a natural gas producer that he owns in his CGM Focus mutual fund. In July, Chesapeake traded for $63 a share. On Friday, it fell as low as $11.99. He says that investors with a stomach for risk and a long time horizon should consider following Warren E. Buffett, who in the last three weeks has invested $8 billion in Goldman Sachs and General Electric. âI think in years to come â I wouldnât say months to come â we will perceive this as being a great value-buying opportunity,â said David P. Stowell, a finance professor at Northwestern and a former managing director at JPMorgan Chase. âTwo and three years from now, it will seem very smart.â Even before their jaw-dropping plunge of the last month, stocks were not expensive by historical standards, based on fundamentals like earnings and cash flow. Now, after falling 30 percent or more since early September, stocks in stalwart, profitable corporations like Nokia, Exxon Mobil and Boeing are trading at nine times their annual profits per share or less. Many smaller companies are even cheaper. Some of those stocks are trading at five times earnings or less. Those ratios are historically low. Over all, the Standard & Poorâs 500-stock index is trading at about 13 times its expected profits for 2009, its lowest level in decades. In contrast, at the height of the technology bubble in early 2000, the stocks in the S.& P. traded at about 30 times earnings, the highest level ever. At the same time, the 10-year Treasury bond paid about 6 percent interest, compared with less than 4 percent today. For example, Newell Rubbermaid fell to $12.82 on Friday from $17.34 on Oct. 1, a 26 percent decline in 10 days. Newell Rubbermaid now trades at its lowest levels since 1990, and just eight times its expected earnings for next year. Yet Newell Rubbermaid, whose brands include Calphalon, is profitable and insulated from the credit crisis, said William G. Schmitz Jr., who follows household products companies for Deutsche Bank. âThereâs really no balance sheet risk,â Mr. Schmitz said. The company also pays a 6 percent dividend. Newell Rubbermaid said in July that it would earn $1.40 to $1.60 a share for 2008, excluding restructuring charges. For 2009, stock analysts predict it will make $1.53 a share. And while a slowing economy may mean that people will be buying fewer products from Newell Rubbermaid, the recent plunge in oil prices will reduce its costs, Mr. Schmitz said. âThe way the stockâs reacted, youâd think they were going out of business,â he said.