commission agent vs middleman

commission agent

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

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

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

middleman

noun
  • An intermediary, agent between two (or more) parties. 

  • An intermediate dealer between the manufacturer and the retailer or customer. 

  • One who rents land in large tracts, and lets it in small portions to the peasantry. 

verb
  • To act as a middleman or intermediary. 

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