Prominent bank CEOs this week on CNBC warning that cracks are starting to show in the US economy. JP Morgan's Jamie Diamond and Morgan Stanley's Ted Pick yesterday. Wells Fargo CEO Charlie Sharf telling Squawkbox this morning that he quote sees more downside to the economy.But joining me now exclusively here at Goldman Sachs Communicopia and Technology Conference in San Francisco is David Solomon, Goldman Sachs chairman and CEO. And I do want to talk to you about that. But first, I think we have to talk abo ...