Why are CEOs of U.S. firms paid 320 times as much as their workers?

An Employee of the Month at a Missouri hospital got a $6 coupon after surviving Covid. The CEO of the firm that owns the hospital got $30 million. Last August, Jamelle Brown, a technician at Research Medical Center in Kansas City, Missouri, contracted Covid-19 while on the job sanitizing and sterilizing rooms in the facility's emergency department. Luckily, his case wasn't severe, and after having quarantined, he was back at work.
Read more: https://www.nbcnews.com/business/corporations/ceos-public-u-s-firms-earn-320-times-much-workers-n1263195?source=Snapzu