1 Economics 101 Fall 2011 Homework #6 Due: 12/13/2010 in lecture Directions: The homework will be collected in a box before the lecture. Please place your name, TA name and section number on top of the homework (legibly). Make sure you write your name as it appears on your ID so that you can receive the correct grade. Please remember the section number for the section you are registered, because you will need that number when you submit exams and homework. Late homework will not be accepted so make plans ahead of time. Please show your work. Good luck! 1. Monopoly Suppose Exxon Mobile purchased every gas company in the world and set their prices. Then, it would have a control of the gas market with no other competition. Thus Exxon Mobile becomes a monopolist in providing gas. The market demand curve faced by Exxon Mobile is P = -Q + 40, and Exxon Mobile’s cost is given by TC=Q2 + 140, and the marginal cost is given by MC=2Q. a) What is the equation for Exxon Mobile’s Marginal Revenue curve? b) Draw the Demand Curve, Marginal Revenue Curve, Average Cost Curve and Marginal Cost Curve for this monopolist in a graph. Label your graph carefully and completely. c) What is the monopolist’s profit-maximizing production quantity QM? What price will the monopolist charge PM? d) Compute the consumer surplus, producer surplus and profits for the monopolist. Now, suppose there is a technological change for the monopolist, and its total cost is now given by TC = 20Q (no fixed cost), and its marginal cost is given by MC = 20. e) What is the monopolist’s profit-maximizing production quantity QM? What price will the monopolist charge PM? Show these values in a graph. f) Suppose this market was a perfectly competitive market (i.e., the monopolist’s demand curve is still the market demand curve, but now there are many firms providing gas for the market). Given the market is perfectly competitive, what would be the equilibrium price (Ppc) and quantity (Qpc) in this competitive market? g) Assume the technological change in the market is still true. What is the difference between the consumer surplus in the monopoly case and the consumer surplus in the perfect competition case? h) What is the difference between the producer surplus in the monopoly case and the producer surplus in the perfect competition case? i) What is the dead weight loss caused by the monopolist?2 2. Natural monopoly a) Suppose Madison Gas and Electric (MGE) is a natural monopoly in Madison for electricity. That is the case where one firm can produce the total quantity in a market more cheaply than multiple firms because there is a large fixed cost or economies of scale in this industry. The Demand curve, Average Total Cost curve, Marginal Cost Curve, and Marginal Revenue Curve for this firm are shown in the picture below. The government decides to regulate this market using marginal cost pricing. That is, the firm is told to produce that level of output where MC is equal to P for the last unit produced. a) Identify in the graph the quantity (QMC) and price (PMC) outcomes under this scheme; label it with the letter “A”. Is this regulatory scheme allocatively efficient? Why or why not? b) Compute the profit of the firm. What is the minimum amount of subsidy that will be necessary in order to keep this monopolist in business? Suppose the government decides to use average cost pricing regulation. That is, the government tells the monopoly to produce that level of output where the firm earns zero economic profit. c) Identify in the graph the equilibrium price and quantity that corresponds to this type of regulation label it with the letter “B”. d) Is this price and output combination allocatively efficient? Why or why not? MC4012 20 18 10 14 20MR DATC$Q3 3. Third Degree Price discrimination The University Book Store is the only store (hence, it is a monopoly) that sells the Krugman’s book (Microeconomics) for the Econ 101 class. The staff (maybe some TAs) can only identify customers as morning class or afternoon class, but other than that they all look the same. This monopolist faces demand from two groups of consumers. Demand from morning class is given by: Q1 = 8 – P Demand from afternoon class is given by: Q2 = 12 – 2P The bookstore faces the following cost curves with respect to the market for selling the Krugman text (remember that the bookstore is a monopolist in this scenario): TC = (1/2)Q2 + 4 MC = Q Notice that Q= Q1+ Q2 Finally, for this problem assume that the book store is able to price discriminate between the two markets. a) Which group of customers has the more elastic demand curve? b) What is the equation for Marginal Revenue for each class of consumers? c) Assume the bookstore price discriminates between the two classes. What quantities will the monopolist sell in the two markets (the morning class market and the afternoon class market)? d) What price will the price discriminating monopolist charge in each market? e) Review your answers from parts (a) and (d). Compare the prices that the two classes pay for the textbook: which class pays the higher price and is this the class with the more elastic or more inelastic demand curve? f) Which class gives the monopolist the greater revenue? g) What is the profit of the firm?4 4. Game Theory Amy and Bill live next door and work in the same office building downtown. In the morning each of them can get to the job either by car or by bike. The only road they can use is of very poor quality, and parking is scarce. Amy and Bill are the only potential users of this road. If both go by car it would take each 15 minutes to get to their workplace. Yet, if there is just one car traveling the time goes down to 5 minutes. Traveling by bike is generally quite fast: it only takes 10 minutes if there are no cars. However the local law gives priority to the cars on the road. As a result, it takes 17 minutes to reach the destination by bike if another person decides to drive at the same time. Amy and Bill love to sleep long hours (each minute matters in the morning!), so fast commuting time is their topmost priority. Even if they agree about the mode of transportation at night, there is no way they can guarantee that the neighbor sticks to their promise in the morning. a) Use the information above to fill in the following payoff matrix: Bill Bike Car Amy Bike Car b) Is there any
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