buyer vs commission agent

buyer

noun
  • A person who makes one or more purchases. 

  • A person who purchases items consumed or used as components in the manufacture of products. 

  • A person who purchases items for resale in a retail establishment. 

commission agent

noun
  • A merchant earning a commission by selling goods belonging to others. 

  • An agent entrusted with the possession of goods to be sold in the agent's name. 

  • A person entrusted with a confidential task, often secretly to place a bet. 

How often have the words buyer and commission agent occurred in a corpus of books? (source: Google Ngram Viewer )