Investment guru Warren Buffett isn't sweating the debt ceiling as much as he is some of the country's other issues.

Buffett this weekend said the $16.4 trillion in debt the country has collected is not the number on which everyone should be focused.

"It is not a good thing to have it going up in relation to GDP, that should be stabilized, but the debt itself is not a problem," the CEO of Berkshire Hathaway (NYSE: BRK.A) told CBS' "Sunday Morning" this weekend.

Buffett said the country's debt is a "lower percentage of GDP than it was when we came out of World War II. You've got to think about in relation to GDP."

Here's why debt-to-GDP is what Buffett watches.

To continue reading, please click here...