A Duopoly Example a duopoly is an oligopoly with only two members. It is the simplest type of oligopoly. H arc Inc. items and derived items c ht o 2001 by Harcourt, IncHarcourt, Inc. items and derived items copyright © 2001 by Harcourt, Inc. A Duopoly Example A duopoly is an oligopoly with only two members. It is the simplest type of oligopoly