While health care has rebounded, tens of thousands of workers still haven't returned.
Many flee stressful and unpredictable jobs and seek admin, communications and tech jobs — especially jobs that can be done remotely.
A record 4.3 million people quit their jobs in August, according to the latest Job Openings and Labor Turnover report from the Bureau of Labor Statistics.
The high quit rate and number of new startups signals optimism in the economy's future.
Some people may not feel their workplace is safe. Others may need to provide child care for their families.
Voluntary quitting is at an 18-year high.