U.S. stock investors are wary that a 30 percent slump in oil prices will pressure corporate profits while also presenting a sign of weakness in global growth at a time they are already weighing when the long economic expansion will end.  Crude prices rebounded off of one-year lows to start the week, with investors focused on Thursday’s meeting in Vienna of the Organization of the Petroleum Exporting Countries (OPEC) and allied producing countries including Russia. A monitoring committee of OPEC and its allies agreed on the need to cut oil output in 2019, two sources familiar with the discussions said. Oil’s drop holds economic benefits, including lower costs for some companies and cheaper fuel prices for […]