When a bank can earn more money with less risk, investors should take note. The "value at risk" metric can help you understand why Goldman Sachs and Bank of America may be heading in opposite directions. The Fool's Matt Koppenheffer explains in the following video.

Fool contributor Matt Koppenheffer owns shares of Bank of America. The Motley Fool recommends Goldman Sachs and owns shares of Bank of America. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.