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Transcript of ch09[1]managerialeconomic
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Managerial Economics in a Global Economy
Chapter 9
Market Structure: Perfect Competition, Monopoly and Monopolistic Competition
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Market Structure
Perfect Competition
Monopolistic Competition
Oligopoly
Monopoly
Mor
e C
ompe
titiv
eLess C
ompetitive
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Perfect Competition
• Many buyers and sellers
• Buyers and sellers are price takers
• Product is homogeneous
• Perfect mobility of resources
• Economic agents have perfect knowledge
• Example: Stock Market
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Monopolistic Competition
• Many sellers and buyers
• Differentiated product
• Perfect mobility of resources
• Example: Fast-food outlets
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Oligopoly
• Few sellers and many buyers
• Product may be homogeneous or differentiated
• Barriers to resource mobility
• Example: Automobile manufacturers
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Monopoly
• Single seller and many buyers
• No close substitutes for product
• Significant barriers to resource mobility– Control of an essential input– Patents or copyrights– Economies of scale: Natural monopoly– Government franchise: Post office
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Perfect Competition:Price Determination
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Perfect Competition:Price Determination
625 5QD P 175 5QS P QD QS
625 5 175 5P P
450 10P
$45P
625 5 625 5(45) 400QD P
175 5 175 5(45) 400QS P
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Perfect Competition:Short-Run Equilibrium
Firm’s Demand Curve = Market Price
= Marginal Revenue
Firm’s Supply Curve = Marginal Cost
where Marginal Cost > Average Variable Cost
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Perfect Competition:Short-Run Equilibrium
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Perfect Competition:Long-Run Equilibrium
Price = Marginal Cost = Average Total Cost
Quantity is set by the firm so that short-run:
At the same quantity, long-run:
Price = Marginal Cost = Average Cost
Economic Profit = 0
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Perfect Competition:Long-Run Equilibrium
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Competition in theGlobal Economy
Domestic Supply
Domestic Demand
World Supply
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Competition in theGlobal Economy
• Foreign Exchange Rate– Price of a foreign currency in terms of the
domestic currency
• Depreciation of the Domestic Currency– Increase in the price of a foreign currency
relative to the domestic currency
• Appreciation of the Domestic Currency– Decrease in the price of a foreign currency
relative to the domestic currency
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Competition in theGlobal Economy
Demand for Pounds
Supply of Pounds
R = Exchange Rate = Dollar Price of Pounds
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Monopoly
• Single seller that produces a product with no close substitutes
• Sources of Monopoly– Control of an essential input to a product– Patents or copyrights– Economies of scale: Natural monopoly– Government franchise: Post office
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
MonopolyShort-Run Equilibrium
• Demand curve for the firm is the market demand curve
• Firm produces a quantity (Q*) where marginal revenue (MR) is equal to marginal cost (MC)
• Exception: Q* = 0 if average variable cost (AVC) is above the demand curve at all levels of output
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
MonopolyShort-Run Equilibrium
Q* = 500
P* = $11
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
MonopolyLong-Run Equilibrium
Q* = 700
P* = $9
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Social Cost of Monopoly
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Monopolistic Competition
• Many sellers of differentiated (similar but not identical) products
• Limited monopoly power
• Downward-sloping demand curve
• Increase in market share by competitors causes decrease in demand for the firm’s product
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Monopolistic CompetitionShort-Run Equilibrium
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Monopolistic CompetitionLong-Run Equilibrium
Profit = 0
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PowerPoint Slides by Robert F. Brooker Copyright (c) 2001 by Harcourt, Inc. All rights reserved.
Monopolistic CompetitionLong-Run Equilibrium
Cost without selling expenses
Cost with selling expenses