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7. Short-run supply and long-run equilibrium Consider the competitive market for rhenium. 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. 60 40 ATC 20 10 MC- AVC 10 30 40 60 60 70 80 90 QUANTITY (Thousands of pounds) The following graph plots the market demand curve for rhenium. 100 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. PRICE (Dollars per pound) 888888888 • Supply (10 firms) Supply (15 firms) Demand Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) If there were 10 firms in this market, the short-run equilibrium price of rhenium would be Therefore, in the long run, firms would would If there were 10 firms in this market, the short-run equilibrium price of rhenium would be S . Therefore, in the long run, firms would would Because you know that competitive firms earn, per pound. At that price, firms in this industry the rhenium market. per pound. At that price, firms in this industry the rhenium market. 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 rhenium 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

7. Short-run supply and long-run equilibrium Consider the competitive market for rhenium. 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. 60 40 ATC 20 10 MC- AVC 10 30 40 60 60 70 80 90 QUANTITY (Thousands of pounds) The following graph plots the market demand curve for rhenium. 100 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. PRICE (Dollars per pound) 888888888 • Supply (10 firms) Supply (15 firms) Demand Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) If there were 10 firms in this market, the short-run equilibrium price of rhenium would be Therefore, in the long run, firms would would If there were 10 firms in this market, the short-run equilibrium price of rhenium would be S . Therefore, in the long run, firms would would Because you know that competitive firms earn, per pound. At that price, firms in this industry the rhenium market. per pound. At that price, firms in this industry the rhenium market. 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 rhenium 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

Essentials of Economics (MindTap Course List)
Essentials of Economics (MindTap Course List)
8th Edition
ISBN:9781337091992
Author:N. Gregory Mankiw
Publisher:N. Gregory Mankiw
Chapter13: Firms In Competitive Markets
Section: Chapter Questions
Problem 8PA
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7. Short-run supply and long-run equilibrium Consider the competitive market for rhenium. 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. 60 40 ATC 20 10 MC- AVC 10 30 40 60 60 70 80 90 QUANTITY (Thousands of pounds) The following graph plots the market demand curve for rhenium. 100 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. PRICE (Dollars per pound) 888888888 • Supply (10 firms) Supply (15 firms) Demand Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) If there were 10 firms in this market, the short-run equilibrium price of rhenium would be Therefore, in the long run, firms would would If there were 10 firms in this market, the short-run equilibrium price of rhenium would be S . Therefore, in the long run, firms would would Because you know that competitive firms earn, per pound. At that price, firms in this industry the rhenium market. per pound. At that price, firms in this industry the rhenium market. 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 rhenium 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
Transcribed Image Text:7. Short-run supply and long-run equilibrium Consider the competitive market for rhenium. 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. 60 40 ATC 20 10 MC- AVC 10 30 40 60 60 70 80 90 QUANTITY (Thousands of pounds) The following graph plots the market demand curve for rhenium. 100 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. PRICE (Dollars per pound) 888888888 • Supply (10 firms) Supply (15 firms) Demand Supply (20 firms) 125 250 375 500 625 750 875 1000 1125 1250 QUANTITY (Thousands of pounds) If there were 10 firms in this market, the short-run equilibrium price of rhenium would be Therefore, in the long run, firms would would If there were 10 firms in this market, the short-run equilibrium price of rhenium would be S . Therefore, in the long run, firms would would Because you know that competitive firms earn, per pound. At that price, firms in this industry the rhenium market. per pound. At that price, firms in this industry the rhenium market. 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 rhenium 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
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