7. Short-run supply and long-run equilibrium Consider the competitive market for copper. 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. The 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 15 firms. Finally, use the green points (triangle symbol) to plot the short-run industry supply curve when there are 20 firms. If there were 20 firms in this market, the short-run equilibrium price of copper would be ___ per pound. At that price, firms in this industry would (shutdown / earn a positive profit / operate at a loss / earn cero profit ). Therefore, in the long run, firms would (enter / exit / neither) the copper market. Because you know that competitive firms earn (negative / positive / zero) economic profit in the long run, you know the long-run equilibrium price must be ___ per pound. From the graph, you can see that this means there will be (10/15/20) firms operating in the copper industry in long-run equilibrium. (True or False): Assuming implicit costs are positive, each of the firms operating in this industry in the long run earns positive accounting profit.

Principles of Economics 2e
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ISBN:9781947172364
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Publisher:Steven A. Greenlaw; David Shapiro
Chapter9: Monopoly
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Problem 31P: Return to Figure 9.2. Suppose P0 is 10 and P1 is 11. Suppose a new firm with the same LRAC curve as...
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7. Short-run supply and long-run equilibrium

Consider the competitive market for copper. 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.
 
The 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 15 firms. Finally, use the green points (triangle symbol) to plot the short-run industry supply curve when there are 20 firms.
 
If there were 20 firms in this market, the short-run equilibrium price of copper would be ___ per pound. At that price, firms in this industry would (shutdown / earn a positive profit / operate at a loss / earn cero profit ). Therefore, in the long run, firms would (enter / exit / neither) the copper market.
 
Because you know that competitive firms earn (negative / positive / zero) economic profit in the long run, you know the long-run equilibrium price must be ___ per pound. From the graph, you can see that this means there will be (10/15/20) firms operating in the copper industry in long-run equilibrium.
 
(True or False): Assuming implicit costs are positive, each of the firms operating in this industry in the long run earns positive accounting profit.
 
7. Short-run supply and long-run equilibrium
Consider the competitive market for copper. 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.
(?)
100
90
80
70
60
50
40
ATC
30
20
AVC
10
MC O
10
20
30
40
50
60
70
80
90
100
QUANTITY (Thousands of pounds)
The 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 15 firms. Finally, use the green points (triangle symbol) to
plot the short-run industry supply curve when there are 20 firms.
COSTS (Dollars per pound)
Transcribed Image Text:7. Short-run supply and long-run equilibrium Consider the competitive market for copper. 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. (?) 100 90 80 70 60 50 40 ATC 30 20 AVC 10 MC O 10 20 30 40 50 60 70 80 90 100 QUANTITY (Thousands of pounds) The 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 15 firms. Finally, use the green points (triangle symbol) to plot the short-run industry supply curve when there are 20 firms. COSTS (Dollars per pound)
The 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 15 firms. Finally, use the green points (triangle symbol) to
plot the short-run industry supply curve when there are 20 firms.
100
90
Supply (10 firms)
80
70
60
Supply (15 firms)
50
40
Supply (20 firms)
Demand
30
20
10
125
250
375
500
625
750
875 1000 1125 1250
QUANTITY (Thousands of pounds)
If there were 20 firms in this market, the short-run equilibrium price of copper would be $
per pound. At that price, firms in this industry
would
v . Therefore, in the long run, firms would
v the copper market.
Because you know that competitive firms earn
v economic profit in the long run, you know the long-run equilibrium price must be
per pound. From the graph, you can see that this means there will be
v firms operating in the copper industry in long-run
equilibrium.
True or False: Assuming implicit costs are positive, each of the firms operating in this industry in the long run earns positive accounting profit.
O True
O False
PRICE (Dollars per pound)
Transcribed Image Text:The 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 15 firms. Finally, use the green points (triangle symbol) to plot the short-run industry supply curve when there are 20 firms. 100 90 Supply (10 firms) 80 70 60 Supply (15 firms) 50 40 Supply (20 firms) Demand 30 20 10 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) If there were 20 firms in this market, the short-run equilibrium price of copper would be $ per pound. At that price, firms in this industry would v . Therefore, in the long run, firms would v the copper market. Because you know that competitive firms earn v economic profit in the long run, you know the long-run equilibrium price must be per pound. From the graph, you can see that this means there will be v firms operating in the copper industry in long-run equilibrium. True or False: Assuming implicit costs are positive, each of the firms operating in this industry in the long run earns positive accounting profit. O True O False PRICE (Dollars per pound)
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