Question: What type of "informal business group" is the Mitsubishi company considered to be an example of?
Sentence (from "Mitsubishi"): The Mitsubishi Group (三菱グループ , Mitsubishi Gurūpu , also known as the Mitsubishi Group of Companies or Mitsubishi Companies, and informally as the Mitsubishi "Keiretsu") is a group of autonomous Japanese multinational companies in a variety of industries.
Relevant evidence: Yes