Chapter 12



Chapter 10. Monopolistic Competition and Oligopoly

Topics to be Discussed

Monopolistic Competition

Oligopoly

First Mover Advantage---The Stackelberg Model

Price Competition

Competition Versus Collusion

Implications of Oligopolistic Pricing

Cartels

Monopolistic Competition

Characteristics

1) Many firms

2) Free entry and exit

3) Differentiated product

The amount of monopoly power depends on the degree of differentiation.

Examples of this very common market structure include:

Toothpaste

Crest and monopoly power

Procter & Gamble is the sole producer of Crest

Consumers can have a preference for Crest---taste, reputation, decay preventing efficacy

The greater the preference (differentiation) the higher the price.

Question: Does Procter & Gamble have much monopoly power in the market for Crest?

Monopolistic Competition

The Makings of Monopolistic Competition

Two important characteristics

Differentiated but highly substitutable products

free entry and exit

[pic]

Observations (short-run)

Downward sloping demand--differentiated product

Demand is relatively elastic--good substitutes

MR < P

Profits are maximized when MR = MC

This firm is making economic profits

Observations (long-run)

Profits will attract new firms to the industry (no barriers to entry)

The old firm’s demand will decrease to DLR

Firm’s output and price will fall

Industry output will rise

No economic profit (P = AC)

P > MC -- some monopoly power

[pic]

Monopolistic Competition

Monopolistic Competition and Economic Efficiency

The monopoly power (differentiation) yield a higher price than perfect competition. If price was lowered to the point where MC = D, consumer surplus would increase by the yellow triangle.

Monopolistic Competition and Economic Efficiency

With no economic profits in the long run, the firm is still not producing at minimum AC and excess capacity exists.

Monopolistic Competition

Questions

1) If the market became competitive, what would happen to output and price?

2) Should monopolistic competition be regulated?

3) What is the degree of monopoly power?

What is the benefit of product diversity?

Oligopoly

Characteristics

Small number of firms

Product differentiation may or may not exist

Barriers to entry

Oligopoly markets commonly exist

Examples

Automobiles, Steel, Aluminum, Petrochemicals, Electrical equipment, Computers

The barriers to entry are:

Natural

Scale economies, Patents, Technology, Name recognition

Question

What are the possible rival responses to a 10% price cut by Ford?

Equilibrium in an Oligopolistic Market

In perfect competition, monopoly, and monopolistic competition the producers did not have to consider a rival’s response when choosing output and price.

In oligopoly the producers must consider the response of competitors when choosing output and price.

Equilibrium in an Oligopolistic Market

Defining Equilibrium

Firms doing the best they can and have no incentive to change their output or price

All firms assume competitors are taking rival decisions into account.

Nash Equilibrium

Each firm is doing the best it can given what its competitors are doing.

The Cournot Model

Duopoly

Two firms competing with each other

Homogenous good

The output of the other firm is fixed

An Example of the Cournot Equilibrium

Duopoly

Market demand is P =950 - Q where Q = Q1 + Q2

MC1 = MC2 = AC=50

Firm 1’s Output Decision

The Reaction Curve

F1’s profit-maximizing output is a decreasing schedule of the expected output of F2.

1. Reaction Curves

petitive Equilibrium and Cournot Equilibrium

3.Collusive Equilibrium and Contract Curve.

Questions

1) If the firms are not producing at the Cournot equilibrium, will they adjust until the Cournot equilibrium is reached?

2) When is it rational to assume that its competitor’s output is fixed?

First Mover Advantage--The Stackelberg Model

Assumptions

One firm can set output first

MC = 50

Market demand is P = 950 - Q where Q = total output

Firm 1 sets output first and firm 2 then makes an output decision

Firm 1

Must consider the reaction of Firm 2

Firm 2

Takes Firm 1’s output as fixed and therefore determines output with the Cournot reaction curve--Q2 = 450 - 1/2Q1

Questions

Why is it more profitable to be the first mover?

Implications of the Oligipolistic Pricing

Observations of Oligopoly Behavior

1) In some oligopoly markets, pricing behavior in time can create a predictable pricing environment and implied collusion may occur.

2) In other oligopoly markets, the firms are very aggressive and collusion is not possible.

Firms are reluctant to change price because of the likely response of their competitors.

In this case prices tend to be relatively rigid.

The Kinked Demand Curve

1. If the producer raises price the competitors will not and the demand will be elastic.

2. If the producer lowers price the competitors will follow and the demand will be inelastic.

3. With two demand functions there are two marginal revenue functions.

[pic] [pic]

[pic] [pic]

4. So long as marginal cost is in the vertical region of the marginal revenue curve, price and output will remain constant.

[pic]

The Dominant Firm Model

In some oligopolistic markets, one large firm has a major share of total sales, and a group of smaller firms supplies the remainder of the market.

The large firm might then act as the dominant firm, setting a price that maximized its own profits.

Cartels

Characteristics

1) Explicit agreements to set output and price

2) May not include all firms

3) Most often international

Examples of successful cartels

OPEC

International Bauxite Association

Examples of unsuccessful cartels

Copper, Tin, Coffee, Tea, Cocoa

4) Conditions for success

Competitive alternative sufficiently deters cheating

Potential of monopoly power--inelastic demand

Summary

In a monopolistically competitive market, firms compete by selling differentiated products, which are highly substitutable.

In an oligopolistic market, only a few firms account for most or all of production.

In the Cournot model of oligopoly, firms make their output decisions at the same time, each taking the other’s output as fixed.

In the Stackelberg model, one firm sets its output first.

Firms would earn higher profits by collusively agreeing to raise prices, but the antitrust laws usually prohibit this.

In a cartel, producers explicitly collude in setting prices and output levels.

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