Goldman Sachs revenue slumps to lowest in more than four years

Goldman Sachs Group Inc's quarterly profit fell by more than half and revenue slumped to its lowest in more than four years as market volatility hit the Wall Street bank's bond trading and investment banking businesses. Goldman, wrapping up a dismal quarter for big U.S. banks, reported a 40 percent drop in net revenue, reflecting declines in all of its main businesses. As with other banks, Goldman's trading revenue was hit by sliding commodity and oil prices, worries about the Chinese economy an