ECON101 Lecture Notes - Perfect Competition, Marginal Revenue, Natural Monopoly

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ECON101 Full Course Notes
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ECON101 Full Course Notes
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Monopoly: a market with a single firm that produces a good or service for which no close substitute exists and that is protected by a barrier that prevents other firms from selling that good or service. If a good has a close substitute, even though only one firm produces it, that firm effectively faces competition from the producers of the substitute. A monopoly sells a good or service that has no good substitute. A constraint that protects a firm from potential competitors is called a barrier to entry. The three types of barrier to entry are: natural, ownership, legal. A natural barrier to entry creates a natural monopoly: an industry in which economies of scale enable one firm to supply the entire market at the lowest possible cost. The firms that deliver gas, water, and electricity to our homes are examples of natural monopoly.

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