What situation resulted in the rapid increase of employer-sponsored healthcare insurance during World War II?

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During World War II, the U.S. government imposed wage freezes to control inflation. Employers, unable to compete for workers by offering higher wages, began to offer benefits like health insurance as a way to attract and retain employees. This led to the rapid increase of employer-sponsored healthcare insurance.

What Situation Resulted in the Rapid Increase of Employer-Sponsored Healthcare