There are many reasons why Oligopolies, the most common would be the size savings. If these are found in the automobile industry, for example, As many large companies are able to produce at the lowest cost, on average, almost impossible for new companies to enter the industry. Smaller companies can not be produced in low-cost and will soon be joined by businesses to start the competition very large far more than is required is likely to be unestablished companies to raise before the profit proof.
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