Warren Buffett, chairman and CEO of Berkshire Hathaway, attends the Allen & Company Sun Valley Conference on July 13, 2012, in Sun Valley, Idaho. - 

This final note today, in which Warren Buffett basically tells corporate America to stop whining. Buffett's out with his annual letter to shareholders in his holding company Berkshire Hathaway. He is -- as befits a guy worth many billions of dollars -- relentlessly positive about the prospects for the American economy.

So positive, in fact, that he has a message for CEOs worried about the uncertainty today's political climate brings. "There's always been uncertainty," he said. And "if you're a CEO who has some large, profitable project you are shelving because of short-term worries, call Berkshire. Let us unburden you," he says.

He also, by the way, adds up the total percentage change of the value of Berkshire Hathaway stock since he started running the company in 1964. Hang on to your hats -- ticker symbol BRK up 586,817 percent in the past 48 years.

Listen to our interviews with Buffett from last year, and hear his thoughts on Jamie Dimon and the investing mistakes he's made.

Follow Kai Ryssdal at @kairyssdal