Explain why managers are paid more than retail salespeople. In 2010, 828,000 Americans had full-time management jobs

Question:

Explain why managers are paid more than retail salespeople.
In 2010, 828,000 Americans had full-time management jobs that paid an average of $96,450 a year while 4.3 million Americans had full-time retail sales jobs that paid an average of $20,670 a year. Managers require a high school certificate while retail sales people don’t but they undergo training.