In 2002, the cheese manufacturing industry in the united states had a four-firm concentration ratio of 34 percent. this implies that the cheese manufacturing industry is not an oligopoly market. Oligopoly markets are markets that are dominated by very few suppliers. They can be found in all countries and in a wide range of sectors. Some oligopoly markets are competitive, while others are significantly less so, or at least may appear so. Competition authorities are often called upon to investigate concerns of concerted actions or lack of vigorous competition.
When firms in the same industry work together to increase their mutual profits rather than competing stubbornly with each other, it is known as an oligopoly situation. Oligopoly markets are found all over the world and even appear to be increasing in some industries.
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