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Econ+100A-Practice+Exercises+for+the+Final+Exam+-Fall+2011

# Econ+100A-Practice+Exercises+for+the+Final+Exam+-Fall+2011...

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UCI Practice Exercises for the Final Econ 100 A – Prof El Hag 1) According to the law of diminishing returns A) the total product of an input will eventually be negative. B) the total product of an input will eventually decline. C) the marginal product of an input will eventually be negative. D) the marginal product of an input will eventually decline. E) none of the above Answer: D 2) Jim left his previous job as a sales manager and started his own sales consulting business. He previously earned \$70,000 per year, but he now pays himself \$25,000 per year while he is building the new business. What is the economic cost of the time he contributes to the new business? 3) Consider the following statements when answering this question; I. Suppose a semiconductor chip factory uses a technology where the average product of labor is constant for all employment levels. This technology obeys the law of diminishing returns. II. Suppose a semiconductor chip factory uses a technology where the marginal product of labor rises, then is constant and finally falls as employment increases. This technology obeys the law of diminishing returns. 4) You operate a car detailing business with a fixed amount of machinery (capital), but you have recently altered the number of workers that you employ per hour. Three employees can generate an average product of 4 cars per person in each hour, and five employees can generate an average product of 3 cars per person in each hour. What is the marginal product of labor as you increase the labor from three to five employees?

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5) Use the following two statements to answer this question: I. The average cost curve and the average variable cost curve reach their minima at the same level of output. II. The average cost curve and the marginal cost curve reach their minima at the same level of output. A) Both I and II are true. B) I is true, and II is false. C) I is false, and II is true. D) Both I and II are false. Answer: D 6) Assume that a firm spends \$500 on two inputs, labor (graphed on the horizontal axis) and capital (graphed on the vertical axis). If the wage rate is \$20 per hour and the rental cost of capital is \$25 per hour, the slope of the isocost curve will be
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