Q: Which equation correctly represents a firm's profit?

$$\text{Profit} = \text{Total Revenue} - \text{Total Cost}$$

Question 1

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

Accepted Answer

There are significant barriers to entry and exit.

Question 2

In a perfectly competitive market, the demand curve facing an individual firm is:

Accepted Answer

Perfectly elastic

Question 3

A firm in a perfectly competitive market maximizes profit by producing the quantity where:

Accepted Answer

$$MC = MR$$

Question 4

If the market price is below a firm's average variable cost in the short run, the firm should:

Accepted Answer

Temporarily shut down

Question 5

Which equation correctly represents a firm's profit?

Accepted Answer

$$	ext{Profit} = 	ext{Total Revenue} - 	ext{Total Cost}$$

Question 6

Suppose a wheat farmer operates in a perfectly competitive market. If the market price is $$P^*$$, what is the farmer's marginal revenue for each additional bushel sold?

Accepted Answer

$$MR = P^*$$

Question 7

Which of the following best explains why firms in perfectly competitive markets are price takers?

Accepted Answer

Each firm produces a small fraction of total market output.

Question 8

If a firm’s total revenue is $$TR = 230 $$and its total cost is $$TC = 160$$, what is its profit?

Accepted Answer

$$70$$

Question 9

In the long run, if firms in a perfectly competitive market are earning economic profits, what will happen?

Accepted Answer

New firms will enter the market, driving profits to zero.

Question 10

Which of the following is true about the relationship between price ($$P$$), average total cost ($$ATC$$), and profit in a perfectly competitive market?

Accepted Answer

If $$P \u003e ATC$$, the firm earns a profit.

Question 11

A firm’s average revenue ($$AR) in a $$perfectly competitive market is equal to:

Accepted Answer

Market price ($$P)$$

Question 12

Which of the following best describes economies of scale?

Accepted Answer

Long-run average total cost decreases as output increases.

Question 13

If a firm is operating at a loss in the short run but price is greater than average variable cost, what should the firm do?

Accepted Answer

Continue producing to cover variable costs.

Question 14

Which of the following is a reason for a firm to exit the market in the long run?

Accepted Answer

Price is consistently below average total cost.

Question 15

In the short run, which costs are considered fixed for a firm?

Accepted Answer

Costs that do not change with output, such as rent or salaries.

Question 16

If a firm’s marginal cost ($$MC) is $$less than marginal revenue ($$MR$$), what should the firm do?

Accepted Answer

Increase output to maximize profit.

Question 17

Which of the following best describes diseconomies of scale?

Accepted Answer

Long-run average total cost increases as output increases.

Question 18

Why is understanding the cost of production important for firms?

Accepted Answer

It allows firms to make informed decisions to remain competitive and efficient.

Question 19

In a perfectly competitive market, what happens to the market price if one firm increases its output?

Accepted Answer

The market price remains unchanged.

Question 20

Which of the following is true about the entry and exit of firms in the long run in a perfectly competitive market?

Accepted Answer

Firms enter when there are profits and exit when there are losses, leading to zero economic profit in the long run.

Firms in Perfectly Competitive Markets: Microeconomics Study Notes

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