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Course: ECON 101, Fall 2008
School: Wisconsin
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101 Economics Fall 2002 Answers to Practice Questions Week 8 Perfect competition-answer key 1) What is the main difference between accounting profits and economic profits? c) Accounting profits take into account only explicit costs were economic profits consider both explicit and implicit costs. 2) Which of the following is not true when a firm is maximizing profits? a) The firm's supply curve is equal to the...

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101 Economics Fall 2002 Answers to Practice Questions Week 8 Perfect competition-answer key 1) What is the main difference between accounting profits and economic profits? c) Accounting profits take into account only explicit costs were economic profits consider both explicit and implicit costs. 2) Which of the following is not true when a firm is maximizing profits? a) The firm's supply curve is equal to the market's demand curve. 3) Which of the following choices lists attributes of an industry or market that are not likely to be perfectly competitive? a) The production process in the industry has decreasing average total costs. 4) For each firm in a competitive industry the long run average total costs are given by, LRATC = q2 10q + 100. It can be shown (by taking the derivative of total costs) that all firms have a marginal cost curve given by, MC = 3q2 20q + 100. [Note: We will always provide as needed or else sufficient information to find MC: you do not need to know calculus to do this problem or any other problem in Econ 101.] Assume that the market demand is given by QD = -2P + 1,000. Hint: thinking about the implied graph(s) before starting any calculations may most easily solve this question. a) What level of output will each firm choose? Firms will produce at the minimum point of their average cost curves. The marginal cost curve intersects the average cost curve at this point. To find the per firm level of output, equate MC and ATC. Each firm produces 5 units. b) What will the market price be? We know that in a competitive market price equals marginal cost. Plugging the quantity we found above into the marginal cost curve gives MC = P = 75. c) What is market demand? Having found the price it is only a matter of plugging the price into the market demand function to find market demand. Demand is 850. d) How many firms will there be in the industry? We have found that each firm produces 5 units and that market demand is 850. To find the number of firms necessary to produce the amount demanded, divide the market demand by the per firm output. The number of firms is 170. e) What are the firms' economic profits in the run? long In competitive markets there are no economic profits in the long run. 5) Suppose for the industry described in question 4 there is an increase in the market demand for the good. Let the new demand curve be given by QD = -2P + 1,196. a) Describe verbally what will occur in the short run. It is a good idea to draw a graph. What will happen once new firms are able to enter the market? The demand curve shifts to the right. The market clearing price is higher than 75. Each firm chooses to produce the level of output where market price equals marginal cost. Since marginal cost is above the average cost curve at this point, there will be economic profits. In the long run, new firms will enter the industry attracted by the economic profits. The market supply curve will shift to the right until each firm is producing at the minimum point of its average cost curve. b) In the short run, each firm's supply curve will be their marginal cost curve. After a few creative calculations it turns out that each firm will produce 6 units of output in the short run. Calculate one firm's short run profits. To calculate short run profits we must first calculate the market price. There are two methods. First, note that there are still 170 firms and that each firm is now producing 6 thus, market sup...

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