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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

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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 (AVO) curves shown on the following graph. 20 72 34 58 ATC COSTS (Dollars per pound) 40 24 AVC 10 Mc- 8:57 10 22 Supply (10 firms) 34 56 Demand Supply (20 firms S PRICE Dollars per pound) 40 32 Supply (30 firms) 24 10 120 240 00 00 00070140 900 1000 1200 QUANTITY (Thousands of pounds) 8:57P The following graph shows the market demand for copper Use the orange points (square symbol) to prot the initial short-ran 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. if there were 20 firms in this market, the short-run equilibrium price of copper would be $ would Therefore, in the long run, firms would per pound. At that price, firms in this industry 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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