Q: Given the following, calculate the profit for a perfectly competitive firm: $$P = 10$$, $$ATC = 8$$, $$Q = 100.$$

$$Profit = (P - ATC) \times Q = (10 - 8) \times 100 = 200$$

Question 1

Which of the following is NOT a pre-existing feature used to build the model of perfect competition?

Accepted Answer

Firms can influence market price

Question 2

In a perfectly competitive market, what is the relationship between price ($$P$$), marginal revenue ($$MR$$), and average revenue ($$AR$$)?

Accepted Answer

$$P = MR = AR$$

Question 3

Suppose a firm in a perfectly competitive market tries to charge a price higher than the market price. What will happen?

Accepted Answer

The firm will sell nothing

Question 4

Which formula correctly represents marginal revenue ($$MR) $$for a firm?

Accepted Answer

$$MR = \frac{\Delta TR}{\Delta Q}$$

Question 5

A firm maximizes profit by producing the quantity where:

Accepted Answer

$$MR = MC$$

Question 6

If a perfectly competitive firm is producing at a level where $$MR \u003e MC$$, what should the firm do to maximize profit?

Accepted Answer

Increase output

Question 7

Which of the following best describes a price-taker?

Accepted Answer

A firm that can only charge the market price for its product

Question 8

Given the following, calculate the profit for a perfectly competitive firm: $$P = 10$$, $$ATC = 8$$, $$Q = 100.$$

Accepted Answer

$$Profit = (P - ATC) 	imes Q = (10 - 8) 	imes 100 = 200$$

Question 9

Which of the following is a critical result in perfectly competitive markets?

Accepted Answer

Firms are price-takers and cannot influence the market price

Question 10

If total revenue ($$TR) is$$ $$500$$ and quantity ($$Q) is$$ $$50$$, what is the average revenue ($$AR$$)?

Accepted Answer

$$AR = \frac{TR}{Q} = \frac{500}{50} = 10$$

Question 11

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

Accepted Answer

Firms produce differentiated products

Question 12

Why does the demand curve facing an individual firm in perfect competition appear horizontal?

Accepted Answer

Because the firm can sell any quantity at the market price

Question 13

If a firm in a perfectly competitive market is earning zero economic profit, what does this imply?

Accepted Answer

The firm's total revenue equals its total cost, including opportunity costs

Question 14

Which equation correctly represents profit ($$\pi) $$for a firm?

Accepted Answer

$$\pi = TR - TC$$

Question 15

A firm in a perfectly competitive market observes that $$MC \u003e MR at $$its current output. What should it do?

Accepted Answer

Reduce output

Question 16

Which of the following best explains why there is no such thing as a perfectly competitive market in reality?

Accepted Answer

Real-world markets rarely meet all the strict assumptions of perfect competition

Question 17

Suppose the market price is $$15$$, and a firm’s average total cost at the profit-maximizing output is $$12. If $$the firm sells 200 units, what is its profit?

Accepted Answer

$$Profit = (15 - 12) 	imes 200 = 600$$

Question 18

Which of the following is true about the equilibrium price and quantity in a perfectly competitive market?

Accepted Answer

They are determined by the intersection of market demand and supply

Question 19

If a firm’s marginal cost curve is above its average total cost curve at a certain output, what does this indicate?

Accepted Answer

Average total cost is increasing

Question 20

Which of the following is a real-world example of a market that closely approximates perfect competition?

Accepted Answer

Wheat farming

Firms in Competitive Markets: Key Concepts and Analysis

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