# Monopoly and Marginal Cost Essay

3387 Words Sep 24th, 2012 14 Pages
Practice Questions and Answers from Lesson III-3: Monopoly Practice Questions and Answers from Lesson III-3: Monopoly The following questions practice these skills:  Explain the sources of market power.  Apply the quantity and price affects on revenue of any movement along a demand curve.  Find the profit maximizing quantity and price of a single-price monopolist.  Compute deadweight loss from a single-price monopolist.  Compute marginal revenue.  Define the efficiency of P = MC.  Find the profit-maximizing quantity and price of a perfect-price-discriminating monopolist.  Find the profit-maximizing quantity and price of an imperfect-price-discriminating monopolist. Question: Each of the following firms possesses market power. …show more content…
d. The single-price monopolist’s profit per unit is the difference between price and the average total cost. Since there is no fixed cost and the marginal cost is constant (each unit costs the same to produce), the marginal cost is the same as the average total cost. That is, profit per unit is the distance BE. Since the monopolist sells I units, its profit is BE times I, or the rectangle BEHF. e. Consumer surplus is the area under the demand curve and above the price. In part c, we saw that the monopoly price is B. Consumer surplus in monopoly is therefore the triangle AFB. f. Deadweight loss is the surplus that would have been available (either to consumers or producers) under perfect competition but that is lost when there is a single-price monopolist. It is the triangle FRH. g. If a monopolist can price-discriminate perfectly, it will sell the first unit at price A, the second unit at a slightly lower price, and so forth. That is, it will extract from each consumer just that consumer’s willingness to pay, as indicated by the demand curve. It will sell S units, because for the last unit, it can just make a consumer pay a price of E (equal to its marginal cost), and that just covers its marginal cost of producing that last unit. For any further units, it could not make any consumer pay more than its marginal cost, and it therefore stops selling units at quantity

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