Even after a triumphant conference call (admittedly, one full of softballs), Goldman Sachs (GS)...

|About: Goldman Sachs Group Inc. (GS)|By:, SA News Editor

Even after a triumphant conference call (admittedly, one full of softballs), Goldman Sachs (GS) is still a black box - lots of numbers to point at, but who can say how it makes money? Reuters' Matthew Goldstein has been pressing the issue. Some clues may come from charts showing just how important trading is to GS, and a look at the risks it's embracing.