Changes

An oligopoly is an industry or market dominated by a few firms selling a similar (undifferentiated) product.  This is called a "perfect oligopoly."  The few firms can behave in a harmful manner similar to how a monopoly behaves in overcharging customers or otherwise suppressing beneficial competition.

An oligopoly is an industry or market dominated by a few firms selling a similar (undifferentiated) product.  This is called a "perfect oligopoly."  The few firms can behave in a harmful manner similar to how a [[monopoly]] behaves in overcharging customers or otherwise suppressing beneficial competition.

An imperfect oligopoly consists of a few firms in an industry or market, but their product is differentiated, as in the car industry.

An imperfect oligopoly consists of a few firms in an industry or market, but their product is differentiated, as in the car industry.