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Industrie Oekonomie 6
Industrial Organization
Lecture Winter Semester 2009/2010
Prof. Dr. Werner B?nte
Bergische Universit?t Wuppertal
Fachbereich B Schumpeter School -
of Business and Economics
Bergische Universit?t Wuppertal
Gau?stra?e 20
l42119 Wupperta
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 1 |
? Introduction: Econometrics and Oligopoly Theory
Time Schedule
- October to November, 2009
? Advanced Industrial Organization
- November to December, 2009
? Innovation: Theory and Policy
- December 2009 to February, 2010
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 2 |
Introduction to oligopoly theory
? introduction game theory
? basic oligopoly models
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 3 |
Introduction to oligopoly theory
? introduction game theory
? basic oligopoly models
price competition
quantity competition
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 4 |
Monopoly Perfect Competition Oligopoly
Introduction to oligopoly theory
MCp D MC
Market-
structure
D MC
D p p ?
Q Q
Number of
suppliers one many several
Q ?
Decision
rational, profit-maximizing
-
making non-strategically interactive/
strategically
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 5 |
Assumptions
Monopoly
? Only one supplier, many buyers
? No quantity constraints
? One market price (no price discrimination)
? Market entry is impossible
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 6 |
Inverse demand function ( )P p X
Monopoly
Sales: ? ? ( )E X p X X
?
? ?
Costs:
P fit
? ?
? ? ? ? ? ?
C X
X E X C X
?
?ro : ? ?
?X
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 7 |
pMonopoly
p Demand function
Inverse demand function( )p X
X
X)( pX
| November 4, 2009 | Prof. Dr. Werner B?nte | Folie 8 |
Profit function:
Monopoly
? ? ? ?max ( )X p X X C X? ? ?
X
First order condition:
? ? ? ? ? ? ? ?
!
0
d X dp X dC X
p X X
dX dX dX
?
? ? ? ?
Marginal Revenue Marginal Cost
????????? ?????
Second order condition:
? ?2 ( ) ( ) 0p X p X X C X? ? ?
| November 4, 200
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