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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 80 50 882 8 8 8 90 70 PRICE (Dollars per pound) 40 Demand 30 20 10 中 Supply (10 firms) Supply (15 firms) Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) enter exit neither enter nor exit If there were 20 firms in this market, the short-run equilibrium price of copp would operate at a loss . Therefore, in the long run, firms would er pound. At that price, firms in this industry exit the copper market. Because you know that competitive firms earn 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 firms operating in the copper industry in long-run equilibrium.

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 80 50 882 8 8 8 90 70 PRICE (Dollars per pound) 40 Demand 30 20 10 中 Supply (10 firms) Supply (15 firms) Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) enter exit neither enter nor exit If there were 20 firms in this market, the short-run equilibrium price of copp would operate at a loss . Therefore, in the long run, firms would er pound. At that price, firms in this industry exit the copper market. Because you know that competitive firms earn 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 firms operating in the copper industry in long-run equilibrium.

Exploring Economics
Exploring Economics
8th Edition
ISBN:9781544336329
Author:Robert L. Sexton
Publisher:Robert L. Sexton
Chapter12: Firms In Perfectly Competitive Markets
Section: Chapter Questions
Problem 13P
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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 80 50 882 8 8 8 90 70 PRICE (Dollars per pound) 40 Demand 30 20 10 中 Supply (10 firms) Supply (15 firms) Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) enter exit neither enter nor exit If there were 20 firms in this market, the short-run equilibrium price of copp would operate at a loss . Therefore, in the long run, firms would er pound. At that price, firms in this industry exit the copper market. Because you know that competitive firms earn 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 firms operating in the copper industry in long-run equilibrium.
Transcribed Image Text: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 80 50 882 8 8 8 90 70 PRICE (Dollars per pound) 40 Demand 30 20 10 中 Supply (10 firms) Supply (15 firms) Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) enter exit neither enter nor exit If there were 20 firms in this market, the short-run equilibrium price of copp would operate at a loss . Therefore, in the long run, firms would er pound. At that price, firms in this industry exit the copper market. Because you know that competitive firms earn 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 firms operating in the copper industry in long-run equilibrium.
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