Q1. Fill in total revenue and marginal revenue for a monopolistically competitive firm selling jeans at various prices and outputs.

Background

Topic: Monopolistic Competition – Revenue Calculations

This question tests your understanding of how to calculate total revenue (TR) and marginal revenue (MR) for a firm in a monopolistically competitive market, using a table of prices and quantities.

Key Terms and Formulas

• Total Revenue (TR):

• Marginal Revenue (MR):

Step-by-Step Guidance

1. For each quantity sold, calculate total revenue by multiplying the price at that quantity by the number of units sold: .

2. To find marginal revenue for each additional unit, subtract the previous total revenue from the current total revenue: .

3. Fill in the table for each output level, making sure to check your calculations for each step.

4. Compare the marginal revenue curve to the demand curve. In monopolistic competition, the MR curve typically lies below the demand curve because the firm must lower the price to sell additional units.

Try solving on your own before revealing the answer!

Q2. Draw and label the demand curves for Abercrombie & Fitch (monopolistic competition) and an individual orange farmer (perfect competition).

Background

Topic: Demand Curves in Different Market Structures

This question asks you to distinguish between the demand curve faced by a firm in monopolistic competition (downward sloping) and a perfectly competitive firm (perfectly elastic).

Key Terms

• Monopolistic Competition: Many firms, differentiated products, downward-sloping demand curve.

• Perfect Competition: Many firms, identical products, perfectly elastic (horizontal) demand curve for each firm.

Step-by-Step Guidance

1. For Abercrombie & Fitch, draw a downward-sloping demand curve and label it .

2. For the orange farmer, draw a horizontal demand curve and label it .

3. Think about why the orange farmer faces a perfectly elastic demand: the product is identical to competitors, so the farmer can sell any quantity at the market price but nothing above it.

4. Consider why Abercrombie & Fitch faces a downward-sloping demand: product differentiation means they have some control over price.

Try sketching the curves before checking the answer!

Q3. What happens to the quantity of McDonald's cheeseburgers demanded if the price rises from $2.00 to $2.50?

Background

Topic: Price Elasticity of Demand in Monopolistic Competition

This question tests your understanding of how consumers respond to price changes in a market with many close substitutes.

Key Concepts

• Price Elasticity of Demand: Measures how much quantity demanded responds to a change in price.

• Substitutes: In monopolistic competition, many similar products are available, so consumers can switch if the price rises.

Step-by-Step Guidance

1. Recall that in monopolistic competition, firms sell differentiated but similar products, so consumers have alternatives.

2. When McDonald's raises its price, some customers may switch to other fast-food restaurants offering similar cheeseburgers at lower prices.

3. Not all customers will leave; some may prefer McDonald's specifically and continue to buy despite the price increase.

4. Think about which answer choice best reflects this partial but not total loss of customers.

Try reasoning through the options before checking the answer!

Q4. For a monopolistically competitive firm, show the marginal revenue (MR) curve on a demand diagram.

Background

Topic: Marginal Revenue in Monopolistic Competition

This question asks you to understand the relationship between the demand curve and the marginal revenue curve for a firm with market power.

Key Concepts

• Marginal Revenue (MR): The additional revenue from selling one more unit.

• In monopolistic competition, the MR curve lies below the demand curve because lowering price to sell more units reduces revenue on previous units.

Step-by-Step Guidance

1. Start with the demand curve, which is downward sloping.

2. Draw the MR curve starting at the same point on the price axis but with a steeper slope, lying below the demand curve at every quantity except the first unit.

3. Label the MR curve clearly.

4. Remember, the MR curve falls twice as fast as the demand curve for a linear demand function.

Try drawing the MR curve before checking the answer!

Q5. What is the profit-maximizing price and quantity for a monopolistically competitive shampoo firm, and what are its profits?

Background

Topic: Profit Maximization in Monopolistic Competition

This question tests your ability to find the profit-maximizing output and price using a graph, and to calculate economic profit.

Key Terms and Formulas

• Profit Maximization: Occurs where .

• Profit:

Step-by-Step Guidance

1. Find the quantity where the MR curve intersects the MC curve. This is the profit-maximizing output.

2. From this quantity, move up to the demand curve to find the price the firm can charge.

3. To find profit, determine the average total cost (ATC) at the profit-maximizing quantity.

4. Calculate profit using the formula above, but stop before plugging in the final numbers.

Try identifying the intersection and setting up the profit calculation before checking the answer!

Q6. How does the market for value meals change as a monopolistically competitive market moves toward long-run equilibrium?

Background

Topic: Long-Run Equilibrium in Monopolistic Competition

This question tests your understanding of how entry and exit affect demand and profits in the long run.

Key Concepts

• In the long run, economic profits attract new entrants, shifting the demand curve for each firm to the left and making it more elastic.

• Firms break even in the long run as profits are competed away.

Step-by-Step Guidance

1. Recall that positive economic profits in the short run attract new firms.

2. As new firms enter, each existing firm's demand curve shifts left (decreases) and becomes more elastic (flatter).

3. Continue this process until firms earn zero economic profit in the long run.

4. Think about which answer choice best describes this process.

Try reasoning through the long-run adjustment before checking the answer!