Micro Econ: Costs

5. Suppose that a firm produces 200,000 units a year and sells them all for $10 each. The explicit costs of production are $1,500,000 and the implicit costs of production are $300,000. The firm has an accounting profit of: A) $500,000 and an economic profit of $200,000. B) $400,000 and an economic profit of $200,000. C) $300,000 and an economic profit of $400,000. D) $200,000 and an economic profit of $500,000.

A) $500,000 and an economic profit of $200,000.

21. When a firm doubles its inputs and finds that its output has more than doubled, this is known as: A) economies of scale. B) constant returns to scale. C) diseconomies of scale. D) a violation of the law of diminishing returns.

A) economies of scale.

22. The larger the diameter of a natural gas pipeline, the lower is the average total cost of transmitting 1,000 cubic feet of gas 1,000 miles. This is an example of: A) economies of scale. B) normative economies. C) diminishing marginal returns. D) an increasing marginal product of labor.

A) economies of scale.

7. The law of diminishing returns states that: A) as a firm uses more of a variable resource, given the quantity of fixed resources, the average product of the firm will increase. B) as a firm uses more of a variable resource, given the quantity of fixed resources, marginal product of the firm will eventually decrease. C) in the short run, the average total costs of the firm will eventually diminish. D) in the long run, the average total costs of the firm will eventually diminish.

B) as a firm uses more of a variable resource, given the quantity of fixed resources, marginal product of the firm will eventually decrease.

3. If a firm's revenues just cover all its opportunity costs, then: A) normal profit is zero. B) economic profit is zero. C) total revenues equal its explicit costs. D) total revenues equal its implicit costs.

B) economic profit is zero.

20. A firm encountering economies of scale over some range of output will have a: A) rising long-run average cost curve. B) falling long-run average cost curve. C) constant long-run average cost curve. D) rising, then falling, then rising long-run average cost curve.

B) falling long-run average cost curve.

19. The firm's short-run marginal-cost curve is increasing when: A) marginal product is increasing. C) total fixed cost is increasing. B) marginal product is decreasing. D) average fixed cost is decreasing.

B) marginal product is decreasing.

10. When the total product curve is falling, the: A) marginal product of labor is zero. B) marginal product of labor is negative. C) average product of labor is increasing. D) average product of labor must be negative.

B) marginal product of labor is negative.

9. The marginal product of labor curve shows the change in total product resulting from a: A) one-unit increase in the quantity of a particular resource used, letting other resources vary. B) one-unit increase in the quantity of a particular resource used, holding constant other resources. C) change in the cost of a variable resource. D) change in the cost of a fixed resource.

B) one-unit increase in the quantity of a particular resource used, holding constant other resources.

16. The reason the marginal cost curve eventually increases as output increases for the typical firm is because: A) of diseconomies of scale. B) of minimum efficient scale. C) of the law of diminishing returns. D) normal profit exceeds economic profit.

C) of the law of diminishing returns.

1. Implicit costs are: A) equal to total fixed costs. B) comprised entirely of variable costs. C) "payments" for self-employed resources. D) always greater in the short run than in the long run.

C) "payments" for self-employed resources.

14. If you know that with 8 units of output, average fixed cost is $12.50 and average variable cost is $81.25, then total cost at this output level is: A) $93.75. B) $97.78. C) $750. D) $880.

C) $750.

15. With fixed costs of $400, a firm has average total costs of $3 and average variable costs of $2.50. Its output is: A) 200 units. B) 400 units. C) 800 units. D) 1,600 units.

C) 800 units

23. If all resources used in the production of a product are increased by 20 percent and output increases by 20 percent, then there must be: A) economies of scale. C) constant returns to scale. B) diseconomies of scale. D) increasing average total costs.

C) constant returns to scale.

12. Variable costs are: A) sunk costs. B) multiplied by fixed costs. C) costs that change with the level of production. D) defined as the change in total cost resulting from the production of an additional unit of output.

C) costs that change with the level of production.

24. Economies and diseconomies of scale explain why the: A) short-run average fixed cost curve declines so long as output increases. B) marginal cost curve must intersect the minimum point of the firm's average total cost curve. C) long-run average total cost curve is typically U-shaped. D) short-run average variable cost curve is U-shaped.

C) long-run average total cost curve is typically U-shaped.

17. If the short-run average variable costs of production for a firm are rising, then this indicates that: A) average total costs are at a maximum. B) average fixed costs are constant. C) marginal costs are above average variable costs. D) average variable costs are below average fixed costs.

C) marginal costs are above average variable costs.

8. The law of diminishing returns only applies in cases where: A) there is increasing scarcity of factors of production. B) the price of extra units of a factor is increasing. C) there is at least one fixed factor of production. D) capital is a variable input.

C) there is at least one fixed factor of production.

11. When marginal product reaches its maximum, what can be said of total product? A) total product must be at its maximum B) total product starts to decline even if marginal product is positive C) total product is increasing if marginal product is still positive D) total product levels off

C) total product is increasing if marginal product is still positive

4. Suppose a firm sells its product at a price lower than the opportunity cost of the inputs used to produce it. Which is true? A) The firm will earn accounting and economic profits. B) The firm will face accounting and economic losses. C) The firm will face an accounting loss, but earn economic profits. D) The firm may earn accounting profits, but will face economic losses.

D) The firm may earn accounting profits, but will face economic losses.

18. If a more efficient technology was discovered by a firm, there would be: A) an upward shift in the AVC curve. C) a downward shift in the AFC curve. B) an upward shift in the AFC curve. D) a downward shift in the MC curve.

D) a downward shift in the MC curve.

13. Which is not a fixed cost? A) monthly rent of $1,000 contractually specified in a one-year lease B) an insurance premium of $50 per year, paid last month C) an attorney's retainer of $50,000 per year D) a worker's wage of $15 per hour

D) a worker's wage of $15 per hour

2. Which would be an implicit cost for a firm? The cost: A) of worker wages and salaries for the firm. B) paid for leasing a building for the firm. C) paid for production supplies for the firm. D) of wages foregone by the owner of the firm.

D) of wages foregone by the owner of the firm.

6. The short run is a time period in which: A) all resources are fixed. B) the level of output is fixed. C) the size of the production plant is variable. D) some resources are fixed and others are variable.

D) some resources are fixed and others are variable.