A more thorough explanation:

A mercedary is someone who hires people to work for them.

• John is a mercedary who hires workers to help him with his construction business.
• The company's CEO acts as a mercedary by hiring employees to work for the company.

These examples show how a mercedary is someone who is in charge of hiring workers for a specific purpose, such as running a business or completing a project. The mercedary is responsible for finding the right people for the job and making sure they are paid for their work.