Q: Which formula correctly calculates profit for a firm?

$$\text{Profit} = (P - ATC) \times Q$$

Question 1

Which of the following is a defining characteristic of a perfectly competitive market?

Accepted Answer

Products offered by different firms are identical and indistinguishable from one another.

Question 2

In a perfectly competitive market, the marginal revenue (MR) for a firm is:

Accepted Answer

$$MR = \frac{\Delta TR}{\Delta Q}$$ and is equal to the market price at all output levels.

Question 3

Suppose a wheat farmer in a perfectly competitive market faces a market price of $4 per bushel. If the farmer sells 5 bushels, what is the total revenue (TR)?

Accepted Answer

$$TR = 5 	imes 4 = 20$$

Question 4

A firm in perfect competition will maximize profit by producing the quantity where:

Accepted Answer

$$P = MC$$

Question 5

If a perfectly competitive firm’s average variable cost (AVC) is $$3, average total cost (ATC) is 5$$, and the market price is $4, what should the firm do in the short run?

Accepted Answer

Continue producing, since $$P \u003e AVC$$ but $$P \u003c ATC ($$minimize losses).

Question 6

Which formula correctly calculates profit for a firm?

Accepted Answer

$$	ext{Profit} = (P - ATC) 	imes Q$$

Question 7

In the long run, what happens to economic profit in a perfectly competitive market?

Accepted Answer

Economic profit is driven to zero as firms enter or exit the market.

Question 8

A monopoly differs from perfect competition in that:

Accepted Answer

A monopoly faces a downward-sloping demand curve, while a perfectly competitive firm faces a horizontal demand curve.

Question 9

Which of the following is NOT a typical barrier to entry in a monopoly?

Accepted Answer

Product homogeneity

Question 10

If a monopolist wants to maximize profit, it should produce the quantity where:

Accepted Answer

$$MR = MC$$

Question 11

In a monopoly, marginal revenue (MR) is:

Accepted Answer

Less than price for all units except the first.

Question 12

Which of the following best describes deadweight loss in a monopoly?

Accepted Answer

It is the loss of total surplus due to the monopolist producing less than the socially optimal quantity.

Question 13

A firm in perfect competition will shut down in the short run if:

Accepted Answer

$$P \u003c AVC$$

Question 14

Which of the following is necessary for a firm to successfully practice price discrimination?

Accepted Answer

The firm must be able to segment the market and prevent resale.

Question 15

If a monopolist charges a single price to all customers, compared to perfect competition, the monopolist will:

Accepted Answer

Produce less output and charge a higher price.

Question 16

Which equation represents the shutdown condition for a perfectly competitive firm in the short run?

Accepted Answer

$$P \u003c AVC$$

Question 17

Suppose a perfectly competitive firm’s total cost (TC) for producing 4 units is $$12.50, and the total revenue (TR) is 16. $$What is the profit?

Accepted Answer

$$	ext{Profit} = 16 - 12.50 = 3.50$$

Question 18

In the long run, a perfectly competitive firm will exit the market if:

Accepted Answer

$$P \u003c ATC$$

Question 19

Which of the following best describes allocative efficiency in perfect competition?

Accepted Answer

Resources are allocated such that $$P = MC$$, maximizing total surplus.

Question 20

A monopolist’s marginal revenue (MR) becomes negative when:

Accepted Answer

The price effect of selling an additional unit outweighs the output effect, causing total revenue to decrease.

Market Structures and Perfect Competition: Microeconomics Study Notes

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