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Answer to Assignment Seven 1-4.doc

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ECN 104
Tom Barbiero

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Answer to Assignment Seven 1-4 1. Consider the two diagrams below. Diagram A represents a typical firm in a perfectly competitive industry. Diagram B represents the supply and demand conditions in that industry. (a) Describe the price, output, and profit situation for the individual firm in the short run. (b) Describe what will happen to the individual firm and the industry in the long run. Show the changes on diagrams A and B. (a) The firm will sell its output for a price of $3.00 per unit. It is taking an economic loss because MR of $3.00 is less than ATC. (b) In the long run, firms will leave the industry because existing firms are taking economic losses. This decrease in the number of firms will shift the supply curve for the industry to the left and lead to an increase in the market price to $4.00. At this price, the individual firm will neither be making an economic profit nor taking an economic loss. It will be in equilibrium. See graphs above. 2. Describe the graph for a long-run supply curve in an increasing-cost industry. Why does it have this slope? For the graph, quantity or output for the industry will be on the horizontal axis and price will be on the vertical axis. The slope of the graph for a long-run supply curve in an increasing-cost industry will be upsloping. It shows that shows that an increase in the level of output is associated with an increase in the price of the product. The reason for the upward slope is that as firms increase output, they bid up resource
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