Why and how people decide to change careers have always stumped economists. It's apparently not for the money because the highest-paid profession in the country is restless, and health care workers are the most satisfied regardless of their salaries, according to a study by Indeed.com.

"Economists have long wondered what prompts an individual to change occupations. If someone decides to search for a new job how do they decide whether or not to move into a new occupation, which occupations do they consider, and what implications does that have for their current occupation," Tara Sinclair wrote in "What Job Seekers Want: Occupation Satisfaction & Desirability Report."

Past labor market research has concentrated on where job seekers landed after leaving an employer. Sinclair's study for Indeed is more predictive of which occupations could be losing workforce.