Goldman Sachs' (NYSE:GS) metals trading chief David Freeland exits just a year after being...

Goldman Sachs' (NYSE:GS) metals trading chief David Freeland exits just a year after being hired, his departure another sign the company is having trouble expanding into the commodity trading business dominated by the likes of Glencore. With new regulations choking off prop trading, Goldman hoped, but has yet to be able to boost commodity revenues.