Question 1

Which of the following best describes the difference between explicit and implicit costs for a firm?

Accepted Answer

Explicit costs are direct, out-of-pocket payments, while implicit costs represent the opportunity cost of using resources owned by the firm.

Question 2

A firm’s marginal product of labor (MPL) initially increases but eventually begins to fall as more workers are hired. This phenomenon is best explained by:

Accepted Answer

The law of diminishing returns

Question 3

Which of the following equations correctly represents average total cost (ATC)?

Accepted Answer

$$ ATC = \frac{TC}{Q} $$

Question 4

In the short run, a perfectly competitive firm should continue to operate even if it is making losses as long as:

Accepted Answer

$$ P \geq AVC $$

Question 5

Which of the following is NOT a characteristic of a perfectly competitive market?

Accepted Answer

There are significant barriers to entry

Question 6

Suppose a firm’s total cost (TC) is $$500 when producing 100 units and 520 $$when producing 110 units. What is the marginal cost (MC) of producing the additional 10 units?

Accepted Answer

$$ MC = \frac{520 - 500}{110 - 100} = 2 $$

Question 7

Which of the following best explains why the long-run average cost curve (LRAC) may eventually rise as output increases?

Accepted Answer

Diseconomies of scale

Question 8

A monopoly maximizes profit by producing the quantity where:

Accepted Answer

$$ MR = MC $$

Question 9

Which of the following is a barrier to entry that helps protect oligopolies?

Accepted Answer

Control of key resources

Question 10

If a perfectly competitive firm is earning zero economic profit in the long run, which of the following must be true?

Accepted Answer

$$ P = ATC $$

Question 11

Which of the following best describes the concept of economies of scale?

Accepted Answer

Long-run average total cost decreases as output increases

Question 12

In a monopolistically competitive market, firms have some control over price because:

Accepted Answer

Their products are differentiated

Question 13

Which of the following is true about the marginal revenue (MR) curve for a monopoly?

Accepted Answer

It lies below the demand curve

Question 14

A cartel is best defined as:

Accepted Answer

A group of firms that collude to set prices and output

Question 15

Which of the following equations can be used to calculate profit for a firm?

Accepted Answer

$$ Profit = TR - TC $$

Question 16

If a firm’s price is less than its average variable cost ($$ P \u003c AVC $$), what should the firm do in the short run?

Accepted Answer

Shut down production immediately

Question 17

Which of the following is an example of an implicit cost?

Accepted Answer

The foregone salary an entrepreneur could have earned elsewhere

Question 18

In the context of market structures, which is the only structure where firms are price takers?

Accepted Answer

Perfect competition

Question 19

Which of the following best describes allocative efficiency?

Accepted Answer

Resources are allocated such that $$ P = MC $$

Question 20

Suppose a firm in a perfectly competitive market faces a market price of $$10, and its marginal cost (MC) at 50 units is 8$$, while at 60 units it is $12. What should the firm do to maximize profit?

Accepted Answer

Increase output to where $$ MC = 10 $$

Microeconomics Final Exam Review: Production, Costs, and Market Structures

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