Wize AP Microeconomics Textbook > Monopolistic Competition
What is Monopolistic Competition?

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Monopolistic Competition
Monopolistic Competition is an industry with many firms, each selling a differentiated product
Examples:
- Novels
- Movies

Wize Tip
Monopolistic competition and monopoly are not the same thing! A monopoly is an industry with only one firm and monopolistic competition is an industry with many firms.
Differences Between Perfect Competition and Monopolistic Competition
- In perfect competition every firm is a price taker and in monopolistic competition are not price takers. Example: gas stations have to charge the same price, but not every novel is the same price.
- In perfect competition the firms make the same product and in monopolistic competition the firms sell differentiated products. Example: gas at one station is the same as the gas at the other station, but every novel is different.
- In perfect competition each firm faces a horizontal (perfectly elastic) demand and in monopolistic competition each firm faces a downward sloping demand.
- In perfect competition there is no excess capacity and in monopolistic competition there is excess capacity. Excess Capacity - When a firm is not operating at the minimum point of its ATC curve.
Perfect Competition Monopolistic Competition

- In the diagram above the minimum point of ATC occurs at100units of output but the demand only touches the ATC at90units.
- The excess capacity is100 - 90 = 10units.
Similarities Between Perfect Competition and Monopolistic Competition
- If Price > ATC (economic profits) in both industries firms willenterthe industry.
- This will cause price todecreaseuntilPrice = ATC
- In the long run every firm is making0profit because there isfree entry/exit (no barriers to entry)in perfect competition and monopolistic competition.

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Example: Monopolistic Competition
In a monopolistically competitive market, new firms will enter if:
A) price is greater than marginal cost.
B) marginal revenue is greater than average total cost
C) price is greater than average total cost
D) marginal revenue is greater than marginal cost.
C
If P>ATC, firms are making profits so other firms will enter. If MR>MC that just means that the existing firms should increase output (doesn't necessarily mean they are making profits). Profit is (P - ATC)*Q that's why we care about ATC and not MC when we're talking about firms entering the industry.
Practice: Monopolistic Competition
Which of the following statements are false about a firm in a monopolistically competitive market?
Practice: Different Industries
Which industry best resembles monopolistic competition?