Markets showed little effect from the fresh turmoil in the eurozone, after Italian Prime Minister Mario Monti said he would resign in the coming days and Silvio Berlusconi threatened a comeback on an anti-austerity platform.

At the close the Dow Jones Industrial Average was up 14.75 points (0.11 percent) to 13,169.88.

The broad-market S&P 500 added 0.48 (0.03 percent) to 1,418.55, while the tech-rich Nasdaq Composite rose 8.92 points (0.30 percent) to 2,986.96.

Transportation and basic materials shares were strongest, while consumer goods slipped.