Question 1

Which of the following best describes the law of diminishing marginal returns in the context of short-run production?

Accepted Answer

As more units of a variable input are added to fixed inputs, marginal product eventually decreases.

Question 2

Suppose a wind farm increases the number of turbines while keeping land area constant. Initially, output rises rapidly, but after a certain point, each additional turbine adds less to total output. This scenario illustrates:

Accepted Answer

The law of diminishing marginal returns

Question 3

If the total cost (TC) of producing 10 units is $$100 and the total cost of producing 11 units is 108$$, what is the marginal cost (MC) of the 11th unit?

$$MC = TC_{11} - TC_{10}$$

Accepted Answer

$$MC = 8$$

Question 4

Which of the following is true about average cost (AC) in the short run?

Accepted Answer

AC is calculated as $$AC = \frac{TC}{Q}.$$

Question 5

A perfectly competitive firm will maximize profit by producing the quantity where:

Accepted Answer

$$P = MC$$

Question 6

If a firm’s total fixed cost (TFC) is $$50 and its total variable cost (TVC) for producing 5 units is 100$$, what is the average total cost (ATC) at 5 units?

$$ATC = \frac{TFC + TVC}{Q}$$

Accepted Answer

$$ATC = 15$$

Question 7

Which of the following best explains why marginal cost (MC) eventually rises as output increases in the short run?

Accepted Answer

The law of diminishing marginal returns causes additional units of input to be less productive.

Question 8

In the context of wind energy production, which cost is most likely to be considered a fixed cost?

Accepted Answer

Initial investment in land and turbines

Question 9

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

Accepted Answer

$$P = ATC$$

Question 10

A firm’s production function is given by $$Q = 2L$$^{0.5}$$K^{0.5}$$, where $$L is $$labor and $$K is $$capital. If $$L = 16$$ and $$K = 9$$, what is the output $$Q$?

Accepted Answer

$$Q = 12$$

Question 11

Which of the following is NOT a characteristic of perfect competition?

Accepted Answer

There are significant barriers to entry.

Question 12

Suppose the marginal product of labor (MPL) is calculated as $$MPL = \frac{\Delta Q}{\Delta L}. If $$output increases from 100 to 130 when labor increases from 5 to 7, what is the MPL?

Accepted Answer

$$MPL = 10$$

Question 13

Which of the following best describes the relationship between average cost (AC) and marginal cost (MC) when AC is at its minimum?

Accepted Answer

MC equals AC.

Question 14

A solar panel manufacturer experiences decreasing average total cost as output increases. This is an example of:

Accepted Answer

Economies of scale

Question 15

If a firm’s total cost (TC) is given by $$TC = 100 + 5Q + Q^2$, what is the marginal cost (MC) function?

Accepted Answer

$$MC = 5 + 2Q$$

Question 16

Which of the following is a real-world example of a variable input in the short run for a wind farm?

Accepted Answer

The amount of labor hired for maintenance

Question 17

If a firm’s average variable cost (AVC) is $$10$$ and average fixed cost (AFC) is $$5 at a $$certain output, what is the average total cost (ATC)?

$$ATC = AVC + AFC$$

Accepted Answer

$$ATC = 15$$

Question 18

Which of the following statements about the short-run cost curves is correct?

Accepted Answer

Marginal cost (MC) intersects average total cost (ATC) at ATC’s minimum point.

Question 19

A firm faces the following costs: TFC = $$200, TVC = 300$ at Q = 10$. What is the average fixed cost (AFC)?

$$AFC = \frac{TFC}{Q}$

Accepted Answer

$$AFC = 20$$

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