If only one airline serves a town, the question of whether a monopoly exists is:
Based on the given question, we are asked to state whether a monopoly exist in a situation where there is only one airline in a town, and the answer is, yes, that is a monopoly
It is important to note that a monopoly has to do with the domination of one company in a market system whereby there is little to no competition from other companies. In this situation, there is usually higher prices of products because there is a lack of competition for competitive prices.
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