"A person who works for one or more companies finding business for them; a person whose job is to sell land and buildings which are used for business activities." (CD)
The graph displays the other subjects mentioned on the same pages as the subject "Commercial agents". If the same subject occurs on a page with "Commercial agents" more than once, it appears closer to "Commercial agents" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.