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Chapter 11 Pure Compe**on in the Long Run
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11-‐2
The Long Run in Pure Competition
• In the long-‐run • Firms can expand or contract capacity • Firms can enter or exit the industry
LO1
11-‐3
Profit Maximization in the Long Run
• Easy entry and exit • The only long-‐run adjustment we consider
• Iden*cal costs • All firms in the industry have iden*cal costs
• Constant-‐cost industry • Entry and exit of firms do not affect resource prices
LO1
11-‐4
Long Run Adjustment Process
• Adjustment process in pure compe**on • Firms seek profits and shun losses • Firms are free to enter or to exit • Produc*on will occur at firm’s minimum average total cost • Price will equal minimum average total cost
LO2
11-‐5
Long Run Equilibrium
• Entry eliminates profits • Firms enter • Supply increases • Price falls
• Exit eliminates losses • Firms leave • Supply decreases • Price rises
LO2
11-‐6
Entry Eliminates Economic Profits
(a) Single firm
(b) Industry
P P
q Q 0 0 100 90,000 80,000 100,000
ATC
MR
MC
$60
50
40 D1
S1
D2
$60
50
40
S2
LO2
11-‐7
Exit Eliminates Losses
(a) Single firm
(b) Industry
P P
q Q 0 0 100 90,000 80,000 100,000
ATC
MR
MC
$60
50
40 D3
S3
D1
$60
50
40
S1
LO2
11-‐8
Long Run Supply Curves
• Constant-‐cost industry • Entry/exit does not affect LR ATC • Constant resource prices • Special case
• Increasing-‐cost industry • Most industries • LR ATC increases with expansion • Specialized resources
• Decreasing-‐cost industry LO3
11-‐9
LR Supply: Constant-Cost Industry
P
0 Q 90,000 100,000 110,000 Q3 Q1 Q2
$50
P1 P2 P3
S Z1 Z2 Z3
D3 D1 D2
LO3
11-‐10
LR Supply: Increasing-Cost Industry
P
0 Q 90,000 100,000 110,000 Q3 Q1 Q2
$50 P1
S
Y1
Y2
Y3
D3 D1
D2
$45
$55 P2
P3
LO3
11-‐11
LR Supply: Decreasing-Cost Industry
P
0 Q 90,000 100,000 110,000 Q3 Q1 Q2
$50 P1
S
X1
X2
X3
D3
D1
D2
$45
$55 P3
P2
LO3
11-‐12
Pure Competition and Efficiency
• In the long run, efficiency is achieved • ProducKve efficiency • Producing where P = minimum ATC
• AllocaKve efficiency • Producing where P = MC
• Triple equality • P= MC= minimum ATC
• Consumer surplus and producer surplus are maximized
LO4
11-‐13
Pure Competition and Efficiency
Single Firm Market
Price
Price
QuanKty QuanKty
0 0
P MR
D
S
Qe Qf
ATC
MC P=MC=Minimum ATC (normal profit)
P
Consumer surplus
Producer surplus
LO4
11-‐14
Dynamic Adjustments
• Purely compe**ve markets will automa*cally adjust to: • Changes in consumer tastes • Resource supplies • Technology
• Recall the “Invisible Hand”
LO4
11-‐15
Technological Advance and Competition
• Entrepreneurs would like to increase profits beyond just a normal profit • Decrease costs by innova*ng • New product development
LO5
11-‐16
Creative Destruction
• Compe**on and innova*on may lead to “creaKve destrucKon”
• Crea*on of new products and methods may destroy the old products and methods
LO5