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AP Microeconomics

AP Microeconomics Quiz: Profit Maximization

Practice Profit Maximization in AP Microeconomics with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Profit Maximization, giving you a quick way to practice the rules, question types, and explanations that matter most for AP Microeconomics.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

Suppose a perfectly competitive firm produces 100 units of a good at its profit-maximizing quantity. If the market price is 202020, average total cost is 151515, and average variable cost is 121212, what is the firm's total economic profit?

  1. 300300300
  2. 500500500
  3. 800800800
  4. 200020002000
Explanation: Economic profit is calculated as (Price - Average Total Cost) * Quantity. In this case, profit per unit is 20−20 - 20−15 = 555. Total economic profit is the profit per unit multiplied by the quantity, which is $$5 * 100 = $500.

Question 2

A firm's total revenue is maximized at a different quantity of output than its profit. This occurs because profit maximization considers

  1. only fixed costs, whereas revenue maximization considers only variable costs.
  2. both revenue and costs, whereas revenue maximization considers only revenue.
  3. only long-run outcomes, whereas revenue maximization focuses on the short run.
  4. only marginal revenue, whereas revenue maximization focuses on average revenue.
Explanation: Profit is defined as Total Revenue minus Total Cost. Therefore, to maximize profit, a firm must account for its costs of production. Revenue maximization, by contrast, only seeks the output level that generates the most sales revenue, ignoring the costs incurred to produce that output.

Question 3

For a profit-maximizing perfectly competitive firm, productive efficiency is achieved when the firm produces at the quantity where

  1. marginal revenue equals price.
  2. average total cost is minimized.
  3. total revenue equals total cost.
  4. price equals marginal cost.
Explanation: Productive efficiency occurs when a good is produced at the lowest possible cost per unit. This is represented graphically as the minimum point on the average total cost (ATC) curve. While firms may not produce here in the short run, competition forces them to this point in long-run equilibrium.

Question 4

The primary difference between a firm's short-run shutdown decision and its long-run exit decision is that the shutdown decision is based on

  1. whether price covers average variable cost, while the exit decision is based on whether price covers average total cost.
  2. the level of economic profit, while the exit decision is based on the level of accounting profit.
  3. total revenue and total cost, while the exit decision is based on marginal revenue and marginal cost.
  4. market demand, while the exit decision is based on the firm's supply curve.
Explanation: In the short run, a firm must pay its fixed costs regardless of production, so it will operate as long as price covers variable costs. In the long run, all costs are variable, so the firm will exit the industry if it cannot cover all of its costs, which are represented by the average total cost.

Question 5

In a perfectly competitive market in long-run equilibrium, a typical firm will experience which of the following?

  1. Positive economic profits and allocative inefficiency.
  2. Zero economic profit and productive efficiency.
  3. Negative economic profits and productive inefficiency.
  4. Zero economic profit but allocative inefficiency.
Explanation: In long-run equilibrium, entry and exit of firms drive the market price to the minimum of the average total cost (ATC) curve. At this point, P = MC = min ATC. The condition P = min ATC ensures zero economic profit (a normal profit) and productive efficiency. The condition P = MC ensures allocative efficiency.

Question 6

Assume a perfectly competitive firm is maximizing profit. An increase in the market demand for the good it sells will lead to an increase in the firm's

  1. total fixed cost and quantity produced.
  2. marginal revenue and quantity produced.
  3. marginal cost curve and its supply.
  4. average fixed cost but not its price.
Explanation: An increase in market demand will increase the market price. For a perfectly competitive firm, price equals marginal revenue. Facing a higher marginal revenue, the firm will increase its quantity produced to the new point where P = MC, thus maximizing its profit at a higher level of output.

Question 7

If a perfectly competitive firm is earning positive economic profits in the short run, which of the following must be true at its profit-maximizing quantity?

  1. Price is equal to average total cost.
  2. Price is less than average total cost but greater than average variable cost.
  3. Price is greater than average total cost.
  4. Marginal cost is at its minimum point.
Explanation: Positive economic profit occurs when total revenue exceeds total economic cost. On a per-unit basis, this means the price (average revenue) must be greater than the average total cost at the profit-maximizing level of output.

Question 8

A firm in any market structure will maximize its profits by producing the quantity of output at which

  1. total revenue is maximized.
  2. average total cost is minimized.
  3. marginal revenue equals marginal cost.
  4. price equals average total cost.
Explanation: The universal rule for profit maximization is to produce at the quantity where the revenue from the last unit sold (marginal revenue) is equal to the cost of producing that last unit (marginal cost). Producing more would mean MC > MR, reducing profit, while producing less would mean MR > MC, forgoing potential profit.

Question 9

For a perfectly competitive firm, the profit-maximization rule of producing where marginal revenue equals marginal cost can also be stated as producing where

  1. price equals marginal cost.
  2. price equals average variable cost.
  3. total revenue equals total cost.
  4. price equals average total cost.
Explanation: In a perfectly competitive market, firms are price takers, meaning they face a perfectly elastic demand curve at the market price. Therefore, the price (P) is equal to the marginal revenue (MR) for every unit sold. Substituting P for MR in the general profit-maximization rule (MR = MC) gives P = MC.

Question 10

A perfectly competitive firm is producing at a quantity where the market price is 101010, its marginal cost is 888, and its average total cost is 999. To maximize profit, this firm should

  1. increase its output.
  2. decrease its output.
  3. maintain its current output.
  4. shut down production immediately.
Explanation: The firm's marginal revenue is the market price of 101010. Since marginal revenue (101010) is greater than marginal cost (888), the firm can increase its profit by producing and selling more units. It should continue to increase output until marginal cost rises to equal the market price.

Question 11

A profit-maximizing firm in a perfectly competitive industry should shut down in the short run if the market price is

  1. less than its average variable cost.
  2. less than its average total cost.
  3. equal to its marginal cost.
  4. greater than its marginal revenue.
Explanation: The shutdown rule states that a firm should cease production in the short run if the revenue it receives from selling its output (the price) is not sufficient to cover its variable costs of production. If P < AVC, the firm's loss per unit is greater than its fixed cost per unit, so it minimizes losses by shutting down and only incurring fixed costs.

Question 12

A perfectly competitive firm is currently producing and selling 500 widgets per week. The market price is 555, the firm's marginal cost is 666, and its average total cost is 444. To maximize its profits, the firm should

  1. increase production to spread fixed costs over more units.
  2. maintain current production since average cost is below price.
  3. decrease production.
  4. continue producing 500 widgets, as it is making a profit.
Explanation: The firm is producing where its marginal cost (666) is greater than its marginal revenue (the market price of 555). This means the last unit produced cost more to make than it generated in revenue, thus reducing overall profit. The firm should decrease production to a level where price equals marginal cost.

Question 13

If a perfectly competitive firm's total revenue equals its total economic cost at the profit-maximizing level of output, the firm is

  1. earning a positive economic profit.
  2. incurring a loss and should exit the market in the long run.
  3. earning a normal profit, also known as zero economic profit.
  4. producing at a quantity less than the productively efficient level.
Explanation: Economic profit is total revenue minus total economic cost (which includes implicit costs). If these two are equal, economic profit is zero. This is also known as a normal profit, which is the minimum level of profit needed for a company to remain competitive in the market.

Question 14

A change in which of the following will NOT affect the profit-maximizing quantity of output for a perfectly competitive firm in the short run?

  1. The market price of the good.
  2. The firm's fixed costs.
  3. The wages paid to its workers.
  4. The cost of raw materials used in production.
Explanation: The profit-maximizing quantity is determined by the intersection of marginal revenue (price) and marginal cost. Fixed costs do not affect marginal cost, as marginal cost is the change in total cost from producing one more unit. Therefore, a change in fixed costs will affect the firm's profit or loss, but not the quantity it chooses to produce.

Question 15

A firm in a perfectly competitive industry is experiencing economic losses but continues to operate in the short run. Which of the following must be true?

  1. Market price is greater than average total cost.
  2. Market price is between its average variable cost and its average total cost.
  3. Market price is less than its average variable cost.
  4. Other firms will enter the industry, attracted by the low prices.
Explanation: The firm operates in the short run as long as the price covers its average variable costs (P ≥ AVC). If it is making an economic loss, the price must be below its average total cost (P < ATC). Combining these two conditions means the price must be between AVC and ATC.

Question 16

If all firms in a perfectly competitive industry are earning zero economic profit, a typical firm is producing at a quantity where

  1. price is greater than average total cost.
  2. marginal revenue is greater than marginal cost.
  3. price is equal to the minimum of its long-run average total cost.
  4. total revenue is at its maximum possible level.
Explanation: Zero economic profit is the defining characteristic of a perfectly competitive market in long-run equilibrium. This occurs when free entry and exit have adjusted the market price so that it is exactly equal to the lowest possible average total cost for each firm.

Question 17

A perfectly competitive firm's short-run supply curve is its

  1. average total cost curve above the minimum average variable cost.
  2. marginal cost curve above its minimum average variable cost.
  3. average variable cost curve above its marginal cost curve.
  4. entire marginal cost curve.
Explanation: A firm's supply curve shows the quantity it is willing to produce at various prices. A profit-maximizing competitive firm produces where P = MC. However, if the price falls below the minimum average variable cost, the firm will shut down and produce nothing. Therefore, its supply curve is the portion of its marginal cost curve that lies above the shutdown point (min AVC).

Question 18

A per-unit tax is imposed on a good produced by a perfectly competitive industry in long-run equilibrium. In the short run, how will this tax affect a typical firm's profit-maximizing output and its profit?

  1. Output will increase, and profit will increase.
  2. Output will decrease, and the firm will incur an economic loss.
  3. Output will remain the same, but the firm will incur an economic loss.
  4. Output will decrease, and profit will remain zero.
Explanation: A per-unit tax is a variable cost, which shifts the firm's marginal cost and average total cost curves upward. Since the market price (marginal revenue) remains unchanged in the short run, the firm will reduce its output to the new, lower quantity where P = MC'. At this new quantity, the higher ATC will be above the price, resulting in an economic loss.

Question 19

A perfectly competitive firm faces a market price of 404040. Its total fixed cost is 100100100, and its marginal cost is 404040 at 50 units of output. At this quantity, its average variable cost is 303030.

Given the information in the passage, what is the firm's short-run economic profit or loss?

  1. A profit of 500500500
  2. A loss of 100100100
  3. A profit of 400400400
  4. Zero economic profit
Explanation: The profit-maximizing quantity is 50 units, where P=MC=404040. Total Revenue (TR) is P*Q = \$40 * 50 = $2000. Total Variable Cost (TVC) is AVC*Q = $30 * 50 = $1500. Total Cost (TC) is TFC + TVC = $100 + 1500 = $1600. Profit is TR - TC = $2000 - $$1600 = $400.

Question 20

Which of the following scenarios describes a perfectly competitive firm earning a normal profit but not a positive economic profit?

  1. Total revenue is 1,0001,0001,000, explicit costs are 600600600, and implicit costs are 300300300.
  2. Total revenue is 1,0001,0001,000, explicit costs are 600600600, and implicit costs are 400400400.
  3. Total revenue is 1,0001,0001,000, explicit costs are 1,0001,0001,000, and implicit costs are 200200200.
  4. Total revenue is 1,0001,0001,000, explicit costs are 1,2001,2001,200, and implicit costs are 000.
Explanation: Economic profit is Total Revenue - (Explicit Costs + Implicit Costs). Normal profit is equivalent to zero economic profit. In this case, 1,000−(1,000 - (1,000−(600 + 400) = $1,000 - 1,000 = 000. The firm is covering all of its costs, including the opportunity costs of its resources.