Many U.S. workers are insecure about their careers, experts say. The pessimism is heightened by the waning number of jobs in certain professions, such as printing. "The U.S. economy churns a lot, more than in most countries. A lot of jobs are created and destroyed, and it creates a lot of anxiety," says Harry Holzer, a Georgetown University government professor and co-author of "Where Are All the Good Jobs Going."

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