Oil could drop below $20 a barrel as the search for a level that brings supply and demand back into balance makes prices even more volatile, Goldman Sachs Group Inc. predicted. With capacity to store oil exhausted in some places, prices may need to drop low enough to halt crude output that can no longer be stockpiled, said Jeff Currie, Goldman’s head of commodities research. “Once you breach storage capacity, prices have to spike below cash costs because you have to shut in production almost immediately,” Currie said in an interview with Bloomberg Television. Volatility will surge and he “wouldn’t be […]