# MIDTERM #2. The following defini;ons may be used throughout the exam:

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1 Page 1 of 12 NAME: EC Principles of Microeconomics Fall 2012 MIDTERM #2 All should be answered in the following pages. Nothing here requires a very long answer. Graphs many ;mes help, as does neatness. You have 75 minutes to complete this exam. Mark clearly your answers for the mul;ple choice ques;ons in their respec;ve leeers. If more than one alterna;ve is marked you will not get any point from that ques;on. You can use pencil, though if you do so you won t be able to dispute the grading for that ques;on aierwards. You MUST return this exam. Each ques;on clearly states how many points it is worth. The exam is worth 140 points. The following defini;ons may be used throughout the exam: ATC - Average Total Cost AFC - Average Fixed Cost AVC - Average Variable Cost MC - Marginal Cost MR - Marginal Revenue Q - Quan;ty Marginal Cost (MC) is the deriva;ve of the total cost (TC) with respect to quan;ty (Q). Example: TC = Q + 10Q 2 then: MC= Q Marginal Revenue (MR) is the deriva;ve of the total revenue with respect to quan;ty (Q). Example: TR = 100Q - Q 2 then: MR= 100-2Q Use your )me wisely.

2 Page 2 of (5 points) Consider the produc;on func;on for Aysun s Pet Si]ng Service below and mark the alterna;ve that is correct regardless of other details that may not have been provided: Number of workers Output (number of pet visits) a. This produc;on func;on presents decreasing returns on its input b. The marginal product of the third worker is 10 pet visits c. The marginal product of the second worker is higher than the marginal product of the first worker d. The profit maximizing number of workers is (5 points) Suppose that for a par;cular firm the only variable input into the produc;on process is labor and that output equals zero when no workers are hired. In addi;on, suppose that when the firm hires 4 workers, the firm produces 50 units of output. If the fixed cost of produc;on is \$4, the cost per unit of labor is \$20, and the marginal product of labor for the fiih unit of labor is 2, what is the average total cost of produc;on when the firm hires 5 workers? Mark the correct alterna;ve: a. \$1.61 b. \$1.68 c. \$2.00 d. \$2.08

3 Page 3 of 12 Consider the graph below for ques)ons 3 and 4, which represents a certain firm s cost structure (Obs: curve A is always decreasing): 3 - (5 points) Regarding curves shown above, mark the correct alterna;ve: a. A firm in a perfectly compe;;ve market will decide to shutdown in the short- run if price is below the point where curves C and D cross each other b. A firm in a perfectly compe;;ve market will decide to shutdown in the short- run if price is below the point where curves A and D cross each other c. Curves C and B will never cross each other d. None of the above is correct

4 Page 4 of (5 points) Regarding curves shown above, mark the correct alterna;ve: a. A firm with the cost curves above that enters a perfectly compe;;ve market will produce a quan;ty between 1 and 2 in the long- run b. A firm with the cost curves above that enters a perfectly market will produce a between 2 and 3 in the long- run c. A firm with the cost curves above that enters a monopolis;cally compe;;ve market will produce a quan;ty above 3 in the long- run d. A firm with the cost curves above that is the only firm in that market (being, thus, a monopolist), would never have a nega;ve profit 5 - (5 points) Disney, which has a monopoly in the sales of Mickey Mouse T- Shirts, decides to increase its produc;on from 1 million T- shirts to 1.5 million T- shirts. One month later, the sales report comes back with the surprising result that profits went down from \$5 million to \$3 million. Assuming that there were no changes in the cost structure or in the demand curve, mark the alterna;ve that is correct regardless of other details that may not have been provided: a. When changing quan;ty from 1 million to 1.5 million T- shirts, ATC increased b. Disney wasn t maximizing its profit by producing 1 million T- shirts c. When Q=1.5 million, ATC>P d. When Q=1.5 million, MR<MC 6 - (5 points) Senator Hubris wants to pass a law that would require all monopolis;cally compe;;ve firms to operate at their efficient scale. Assuming that all firms are in their long- run equilibrium, if this law were to pass and be enforced, we would expect that monopolis;cally compe;;ve firms would, in the short- run: a. See their profits increase b. Break even c. Lose money d. Not really be affected by the law 7 - (5 points) A profit- maximizing firm with increasing MC is in the US market of corn, which is perfectly compe;;ve. Current price is the long- run equilibrium price. In response to lobby from farmers, the the government decides to raise tariffs on import of corn, which shiis the market supply curve to the lei. Mark the incorrect item: a. In the absence of other changes, we expect a^er the number of producers of corn in the US to decrease in response to that policy b. Soon aier that shii in supply, the firm sees that its marginal revenue went above the marginal cost c. Firms will have a posi;ve profit, in the short- run, in response to that policy d. Consumer surplus will decrease

5 Page 5 of 12 The informa)on in the table below shows the total demand for high- speed Internet subscrip)ons in a small urban market. Assume that each company that provides these subscrip)ons incurs an annual fixed cost of \$200,000 (per year) and that the marginal cost of providing an addi8onal subscrip8on is always \$80. Use that table for ques)ons 8 and 9: Quantity Price (per year) 0 \$320 2,000 \$280 4,000 \$240 6,000 \$200 8,000 \$160 10,000 \$120 12,000 \$80 14,000 \$40 16,000 \$0 8 - (5 points) Suppose that there is only one high- speed Internet service provider in this market and it seeks to maximize its profit. The company will (mark the correct item) Hint: calcula)ng profits from total revenue and total cost is simpler here than thinking in terms of marginal revenue.: a. Sell 6,000 and charge a price of \$200 for each b. Sell 8,000 subscrip;ons and charge a price of \$160 for each subscrip;on c. Sell 10,000 subscrip;ons and charge a price of \$120 for each subscrip;on d. Sell 12,000 subscrip;ons and charge a price of \$80 for each subscrip;on 9 - (5 points) Suppose now that there are two high- speed Internet service provider in this market with the same cost structure above. Mark the correct item: a. If those firms form a successful cartel, then each one will sell 6,000 subscrip;ons b. If those firms are unable to form a successful cartel, we should expect the price to be between \$200 and \$240 c. If those firms are unable to form a successful cartel, then they will not be able to charge a price above marginal cost d. None of the above is correct

6 Page 6 of (5 points) Which of the following condi;ons is characteris;c of a perfectly compe;;ve market in both the short- run and the long- run? (Mark the correct alterna;ve): a. P=MC b. P>MC c. Zero profit d. Produc;on at the efficient scale Consider the game represented by the payoff matrix above to answer ques)ons 12 to 15. Player 2 A B C A P1-4 P2-4 P1-3 P2-5 * P1-1 P2-0 Player 1 B P1-1 P2-5 P1-0 P2-4 P1-2 P2-3 C P1-5 P2-3 * P1-2 P2-0 P1-3 P (2 points) - If Player 1 chooses strategy B, Player 2 may obtain a u;lity value of at most: (2 points) - If Player 2 chooses strategy C, Player 1 s best- response is to play strategy: C

7 Page 7 of (2 points) - Does Player 1 have a dominant strategy? If so, which one is it? No, he doesn t (5 points) - Mark with an asterisk (*) the Nash Equilibria of the game (there may be one, more than one or none) in the payoff matrix itself (10 points) Suppose that a monopolist faces the demand curve below, has a fixed cost of \$50 and a variable cost of \$1 per unit produced. Fill the table below with the values of TR (total revenue), FC (fixed cost), VC (variable cost), TC (total cost) and Profit (if profits are nega;ve, indicate with a minus sign. Ex: - \$200): Price Quantity TR FC VC TC Profit \$ \$ \$ \$ \$ \$

8 Page 8 of (25 points) Keroggs is a profit- maximizing firm that produces and sells cereals, a market. As of November 2012, the firm was making posi;ve economic profits. The firm has posi;ve fixed costs and cereal produc;on presents decreasing returns on its input. A) Draw below a graph showing a demand curve, its marginal revenue (MR), the average total cost (ATC), the marginal cost (MC) and produced (Q) in a way that is consistent with Keroggs situa;on as of November Show in the graph the area that represents the profit of that firm. MC P M ATC P, Costs Profits MR D Q* Q

9 Page 9 of 12 B) Which of those curves will shii as new firms can enter or exit in response to the posi;ve profits? In which way? Show using a simple graph. Demand will shift to the left. MC ATC P, Costs D' D Q C) Will Keroggs sustain its posi;ve profits in the long- run? Draw the same curves you drew on item A) in its long- run configura;on. Be careful and label precisely the curves as well as the quan;ty produced by Keroggs. No, it will not sustain profits in the long-run, since the entry of new firms will shifts its demand to the left until economic profits are zero. MC ATC P, Costs P* D Q* Q

10 Page 10 of (25 points) The demand for electric power in the state of Rhode Island is given by the following inverse demand func;on: P=200-2Q BStar is the only provider of electric power in the state of Rhode Island. Its total cost is given by the following func;on: TC=50Q + Q 2 A) Derive the expressions for the average total cost (ATC), marginal revenue (MR) and marginal cost (MC). What is the (Q) that will be chosen by BStar in order to maximize profit? What will be the price (P) that consumers will pay? ATC=50+Q MR=200-4Q MC=50+2Q P*=150 Q*=25

11 Page 11 of 12 B) Draw a graph with the demand (D), the marginal revenue (MR) and the marginal cost (MC) curves. Point out the quan;ty chosen by the monopolist and iden;fy clearly the areas (you don t need to calculate their values) represen;ng the consumer surplus (CS), the producer surplus (PS) and the deadweight loss (DWL) that results from the monopolist s price choice. Mark clearly the intercepts of the curves with the ver;cal and horizontal axes. MC 200 P, Costs 150 CS DWL PS 50 MR D Q

12 Page 12 of 12 C) Electricity is a regulated market, so that the government can, among other op;ons, set the prices that will be charged by BStar. Suppose that you are the economist responsible for this choice. If your objec;ve is to have an efficient quan;ty of energy (that is, to maximize total surplus), which price would you set for BStar to charge? Would this choice be sustainable in the long- run? You may answer this through a precise number, a graph or clear and succinct explana;ons. The price that leads to an efficient quantity of energy supplied and consumed is the one that will make the marginal cost of production equal to the value given by the marginal consumer (that is, the consumer that would leave the market as soon as the price is even slightly higher). We can find it by first finding the quantity where the MC curve and the demand curves intersect: 50+2Q=200-2Q Q=37.5 Thus, the price is: P=200-2*27.5=\$125 The ATC when Q=37.5 is Thus, P>ATC, which means that even though profits are not as high as without such regulation, BStar will still enjoy positive economic profits. This is, thus, a sustainable long-run solution. MC 200 P, Costs CS PS 50 MR D Q

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