Survey: 1 in 3 workers thinking about quitting

A new survey finds a third of U.S. workers say they seriously considered quitting their jobs at some point in the last three months. And some of them are considering it even if they don't have new employment immediately lined up.

It's a sign of a good economy, says UNO business professor Mark Rosa.

"Since we have had such success in the labor market over the past several years, breaking records, in fact, that people would feel more comfortable in leaving one job in an environment like this," said Rosa. "The labor market is so tight, businesses are trying to find people."

It has some workers pondering quitting even if they don't have a job offer waiting for them.

"People would normally think that's an uncomfortable thing to do. 'Let me get something else set up and then put my notice in on the existing job,'" said Rosa "Others would feel more brazen, and say, 'well, I'll just quit and move on to something else.'"

Rosa says the "quit index" is also something policymakers track to gauge strength in the economy.

The CNBC/SurveyMonkey Workplace Happiness Survey questioned 7,940 U.S. workers between June 21-30.