Take any of the firms mentioned in the Modern Monopolydiscussion thread and discuss the actual competitive environmentthey compete in. The discussion can include information on marketshares, but more importantly what are the true definitions of themarkets and the list of competitors they face? How strong are thesecompetitors? What creates advantages and disadvantages and how dothese stack up? You should use the conditions necessary for PerfectCompetition for a partial guide to this thread.
