Answer:is D
a single supplier of a good or service.
Explanation:
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A monopoly is a market that has: D. a single supplier of a good or service.
A monopoly can be defined as a market structure which is typically characterized by a single supplier (seller) who sells a unique product or service in the market, especially through dominance.
This ultimately implies that, monopoly is a market structure wherein the supplier (seller) has no competitor because he is solely responsible for the sale of a unique product or service without any close substitute.
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