Microeconomics
21st Edition
ISBN: 9781259915727
Author: Campbell R. McConnell, Stanley L. Brue, Sean Masaki Flynn Dr.
Publisher: McGraw-Hill Education
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Question
Chapter 10, Problem 5DQ
To determine
Relevance of pure competition.
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Consider the competitive market for rhodium. Assume that no matter how many firms operate in the industry, every firm is identical and faces the
same marginal cost (MC), average total cost (ATC), and average variable cost (AVC) curves plotted in the following graph.
COSTS (Dollars per pound)
80
72
64
56
co
o
32
+
16
8
0
0
4
MC
0
ATC
AVC
8 12 16 20 24 28
QUANTITY (Thousands of pounds)
32
38, 72
36
40
Ⓒ
Suppose that the pen-making industry is perfectly competitive. Also suppose that each current firm and any potential firms that might enter the industry all have identical cost curves, with minimum ATC = $1.25 per pen. If the market equilibrium price of pens is currently $1.50, what would you expect it to be in the long run? LO11.2 a. $0.25. b. $1.00. c. $1.25. d. $1.50.
✓ Question Completion Status:
A non- competitive firm's demand curve is P = 10-4Q. So its MR is
O 5-2Q
O 10-40
10-8Q
05-Q
QUESTION 3
For a non-competitive firm with a demand curve P = 1800-2Q and marginal costs of MC = $200, how much is the equilibrium quantity
(Q)?
360
400
560
620
QUESTION 4
For a non-competitive firm with a demand curve P = 1800-2Q and marginal costs of MC = $200, how much is the equilibrium price (P*)?
O $500
(4750
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- Suppose that each firm in a competitive industry has the following costs: Total cost: TC = 50 + q2 Marginal cost: MC = q where q is an individual firms quantity produced. The market demand curve for this product is Demand:QD = 120 P where P is the price and Q is the total quantity of the good. Currently, there are 9 firms in the market. a. What is each firms fixed cost? What is its variable cost? Give the equation for average total cost. b. Graph average-total-cost curve and the marginal-cost curve for q from 5 to 15. At what quantity is average-total-cost curve at its minimum? What is marginal cost and average total cost at that quantity? c Give the equation for each firms supply curve. d. Give the equation for the market supply curve for the short run in which the number of firms is fixed. e. What is the equilibrium price and quantity for this market in the short run? f. In this equilibrium, how much does each firm produce? Calculate each firms profit or loss. Is there incentive for firms to enter or exit? g. In the long run with free entry and exit, what is the equilibrium price and quantity in this market? h. In this long-run equilibrium, how much does each firm produce? How many firms are in the market?arrow_forwardCH $1.50 $1.25 $0.75 150 9 In the above figure, assume that So represents the industry supply curve and Do represents the demand curve in a perfectly competitive market. What can be said about the demand curve that an individual firm faces? O An individual firm will face a downward sloping demand curve starting at $1.25. O An individual firm will tace a horizontal demand curve at $1.25. O An individual firm will face a vertical demand curve at 250. O An individual firm will face the demand curve indicated by Do 4arrow_forward3. Suppose the doll company American Girl has an inverse demand curve of P = 150 - 0.25Q, where Q measures the quantity of dolls per day and P is the price per doll. There production function equals Q = LO.5KO.5, they pay wages of 35 and they pay capital rates of 140. What is their daily long-run profit at the profit-maximizing output level?arrow_forward
- 7. Short-run supply and long-run equilibrium Consider the competitive market for rhodium. Assume that no matter how many firms operate in the industry, every firm is identical and faces the same marginal cost (MC), average total cost (ATC), and average variable cost (AVC) curves plotted in the following graph. COSTS (Dollars per pound) 80 72 64 56 48 40 32 24 16 8 O 0 4 MC 8 ATC AVC + + + 12 16 20 24 28 QUANTITY (Thousands of pounds) + 32 ப + 36 40 (?)arrow_forwardThe following diagram shows the market demand for copper. Use the orange points (square symbol) to plot the initial short-run industry supply curve when there are 10 firms in the market. (Hint: You can disregard the portion of the supply curve that corresponds to prices where there is no output since this is the industry supply curve.) Next, use the purple points (diamond symbol) to plot the short-run industry supply curve when there are 20 firms. Finally, use the green points (triangle symbol) to plot the short-run industry supply curve when there are 30 firms. 80 72 Supply (10 firms) 64 56 48 Demand Supply (20 firms) 40 32 Supply (30 firms) 24 16 8 120 240 360 480 600 720 840 960 1080 1200 QUANTITY (Thousands of pounds) If there were 10 firms in this market, the short-run equilibrium price of copper would be $ per pound. At that price, firms in this industry would . Therefore, in the long run, firms would the copper market. Because you know that competitive firms earn economic profit…arrow_forwardTable 14-5 Suppose that a firm in a competitive market faces the following revenues and costs: Quantity Marginal Cost Marginal Revenue (Units) (Dollars) (Dollars) 12 13 14 15 16 17 5 6 7 8 9 10 7 7 7 7 7 7 Refer to Table 14-5. If the firm is maximizing profit, how much profit is it earning? O a. $0.50 O b. $7.50 O c. $10 O d. There is insufficient data to determine the firm's profit.arrow_forward
- The table below describes a firm that sells output in a perfectly competitive market. Note the second column describes total costs. O $8 O $12 O $6 Output O $4 0 1 2 3 4 5 Which of the following market prices would cause the firm's profit-maximizing output level to be equal to 5? 6 Total Cost (in dollars) $3 $9 $14 $18 $23 $30 $40 4arrow_forwardIn the table below, the firm; Output Total Revenue Total Cost $0 $30 $60 $90 $120 $150 $180 $25 $49 $69 $91 $117 $147 $180 O a. cannot be in a perfectly competitive industry, because its short-run economic profits are greater than zero. O b. must be in a perfectly competitive industry, because its marginal cost curve eventually rises. O c. cannot be in a perfectly competitive industry, because its long-run economic profits are greater than zero O d. must be in a perfectly competitive industry, because its marginal revenue is constant. 123 456arrow_forwardThe table shown displays the total costs for various levels of output for a firm operating in a perfectly competitive market. Price $50 $50 $50 $50 $50 $56 When one unit is produced exceed O marginal costs, marginal revenue, more O marginal revenue; marginal costs more O marginal revenue, marginal costs; less Omarginal costs, marginal revenue, less and the fem should produce Quantity 0 1 2 3 4 15 TC $10.00 $20.00 $2750 $77 50 $147.50 $250 00arrow_forward
- The following figure shows the revenue and cost curves for a firm X. RM 10 a. b. C. 7 6 LO 5 4 3.5 0 20 25 30 MC 40 AVC AC AR=MR Units If a firm X achieves productivity efficiency, what will be the total revenuel generated At what price will a firm stop operating? Please explain. If the market price is RM4.00, what is the total profit or total loss.arrow_forwardThe figure shows a perfectly competitive firm. The firm is operating; that is, it has not shut down. The firm produces O A. 20 units of output and earns a normal profit. MC ATC 50 B. 10 units of output and incurs an economic loss. 40 O C. 10 units of output and earns a normal profit. O D. 20 units of output and incurs an economic loss. 30 MR 20 10 10 30 40 Quantity (per day) Price and costs (dollars) 20arrow_forward6. Short-run supply and long-run equilibrium Consider the perfectly competitive market for steel. Assume that, regardless of how many firms are in the industry, every firm in the industry is identical and faces the marginal cost (MC), average total cost (ATC), and average variable cost (AVC) curves shown on the following graph. (?) 80 72 64 56 ATC 48 40 32 24 18 AVC 8 MC O 12 15 18 21 24 27 30 QUANTITY (Thousands of tons) COSTS (Dollars per ton) 3.arrow_forward
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