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Lectures in Microeconomics-Charles W. Upton Duopoly.
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Transcript of Lectures in Microeconomics-Charles W. Upton Duopoly.
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Lectures in Microeconomics-Charles W. Upton
DuopolyP
Q
D
$10
10
$100$8
A
B
13
D’
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Duopoly
Duopoly
P
Q
D
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Duopoly
Duopoly
P
Q
D
$10
$100
10
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Duopoly
Duopoly
P
Q
D
$10
10
$100 $8
A
B
13
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Duopoly
Duopoly
P
Q
D
$10
10
$100 $8
A
B
13
D’
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Duopoly
Definition
• A duopoly is a firm whose profits depends on the behavior of one – and only one – other firm.
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Duopoly
Oligopolies
• A duopoly is a firm whose profits depends on the behavior of one – and only one – other firm.
• An oligopoly is a firm whose profits depends on the behavior of a few firms.
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Duopoly
Duopolies vs. Oligopolies
• A duopoly is a firm whose profits depends on the behavior of one – and only one – other firm.
• An oligopoly is a firm whose profits depends on the behavior of a few firms.
• All duopolies are oligopolies, but all oligopolies are not duopolies.
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Duopoly
Why Duopolies
• A duopoly is a firm whose profits depends on the behavior of one – and only one – other firm.
• An oligopoly is a firm whose profits depends on the behavior of a few firms.
• All duopolies are oligopolies, but all oligopolies are not duopolies.
Duopoly models are simpler
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Duopoly
Defining an Oligopoly
• Often defined by four firm concentration ratio.
What percent of total sales come from the four largest firms?
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Duopoly
Defining an Oligopoly
• Often defined by four firm concentration ratio.
• We use another definition:– When other firms affect demand.
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Duopoly
The Cooperative Solution
• Two firms make up an industry.– How should they set price and output?
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Duopoly
The Cooperative Solution
• Two firms make up an industry.– How should they set price and output?
• One option is to cooperate, work like a monopoly and split monopoly profits
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Duopoly
An Illustration
Q = 100 – 2P
MC = $5
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Duopoly
An Illustration
Q = 100 – 2P
MC = $5
• In a Competitive Industry, P = $5; Q = 90
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Duopoly
An Illustration
Q = 100 – 2P
MC = $5
• In a Competitive Industry, P = $5; Q = 90
• In a Monopoly, P = $27.50; Q = 45
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Duopoly
An Illustration
Q = 100 – 2P
MC = $5
• In a Competitive Industry, P = $5; Q = 90
• In a Monopoly, P = $27.50; Q = 45
• Why not cooperate? Let each produce 22.5 and sell at $27.50
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Duopoly
The Problem
• Cartels are both illegal and difficult to maintain
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Duopoly
The Problem
• Cartels are both illegal and difficult to maintain
• The Solution is to develop models of how firms behave when they cannot explicitly cooperate.
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Duopoly
Modeling Duopoly
• The Cournot Model
• Nash Equilibrium
• The Bertrand Model
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Duopoly
End
©2003 Charles W. Upton