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The answer is D.
A monopoly is a firm that is the only seller of a product in a given industry. We can roughly distinguish two types of monopolies: natural monopolies occur based on natural circumstances like strategic positioning or abundant mineral resources. Besides the natural monopoly, we can also distinguish a legal monopoly. This type of monopolist is operating under the mandate of a government.
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What is the definition of monopoly?
d. a monopoly is a firm that is the only seller of a product in a given industry.