Use the orange points (square symbol) to plot the initial short-run industry supply curve when there are 20 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 40 firms. Finally, use the green points (triangle symbol) to plot the short-run industry supply curve when there are 60 firms. 80 72 Supply (20 firms) 64 56 Demand 48 Supply (40 firms) 40 32 Supply (60 firms) 24 18 120 240 380 480 600 720 840 960 1080 1200 QUANTITY (Thousands of tons) per ton. At that price, firms in this industry would If there were 60 firms in this market, the short-run equilibrium price of steel would be s . Therefore, in the long run, firms would the steel market. Because you know that perfectly competitive firms earn economic profit in the long run, you know the long-run equilibrium price must be s per ton. From the graph, you can see that this means there will be firms operating in the steel industry in long-run equilibrium. PRICE (Dollars per ton)

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Chapter1: Making Economics Decisions
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Use the orange points (square symbol) to plot the initial short-run industry supply curve when there are 20 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 40 firms. Finally, use the green points (triangle symbol) to
plot the short-run industry supply curve when there are 60 firms.
80
72
Supply (20 firms)
64
56
Demand
48
Supply (40 firms)
Supply (60 firms)
16
8
120
240 300
480
600
720 840
980 1080 1200
QUANTITY (Thousands of tons)
If there were 60 firms in this market, the short-run equilibrium price of steel would be $
per ton. At that price, firms in this industry would
v . Therefore, in the long run, firms would
v the steel market,
Because you know that perfectly competitive firms earn
v economic profit in the long run, you know the long-run equilibrium price must
be s
per ton. From the graph, you can see that this means there will be v firms operating in the steel industry in long-run equilibrium.
PRICE (Dollars per ton)
Transcribed Image Text:Use the orange points (square symbol) to plot the initial short-run industry supply curve when there are 20 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 40 firms. Finally, use the green points (triangle symbol) to plot the short-run industry supply curve when there are 60 firms. 80 72 Supply (20 firms) 64 56 Demand 48 Supply (40 firms) Supply (60 firms) 16 8 120 240 300 480 600 720 840 980 1080 1200 QUANTITY (Thousands of tons) If there were 60 firms in this market, the short-run equilibrium price of steel would be $ per ton. At that price, firms in this industry would v . Therefore, in the long run, firms would v the steel market, Because you know that perfectly competitive firms earn v economic profit in the long run, you know the long-run equilibrium price must be s per ton. From the graph, you can see that this means there will be v firms operating in the steel industry in long-run equilibrium. PRICE (Dollars per ton)
6. 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.
Transcribed Image Text:6. 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.
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