University of Hawai‘i at Mānoa Department of Economics

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University of Hawai‘i at Mānoa Department of Economics. ECON 130 (003): Principles of Economics (Micro) http://www2.hawaii.edu/~lindoj Gerard Russo Lecture #22 Thursday, April 1, 2004. LECTURE 22. The Perfectly Competitive Firm in the Long-Run - PowerPoint PPT Presentation

Transcript of University of Hawai‘i at Mānoa Department of Economics

University of Hawai‘i at MānoaDepartment of Economics

ECON 130 (003): Principles of Economics (Micro)

http://www2.hawaii.edu/~lindoj

Gerard Russo

Lecture #22

Thursday, April 1, 2004

LECTURE 22The Perfectly Competitive Firm in the Long-Run

The Perfectly Competitive Industry in the Long-Run: Long-Run SupplyConstant-Cost Industry Increasing-Cost IndustryDecreasing-Cost Industry

(milllions)(thousands)

$/q

$/q

Perfectly Competitive Firm

Perfectly Competitive Industry

MC

LATCS0

P0

Q0q00

ATC

D0

Long-Run Equilibrium: P=AR=MR=MC=ATC=LATC

(milllions)(thousands)

$/q

$/q

Perfectly Competitive Firm

Perfectly Competitive Industry

MC

LATC

S0

P0

Q0q00

ATC

D0

New Short-Run Equilibrium: P=AR=MR=MC>ATC>LATC

D1

Q1

P1

q1

(milllions)(thousands)

$/q

$/q

Perfectly Competitive Firm

Perfectly Competitive Industry

MC LATC S0

P0

Q0q00

ATC

D0

D1

Q1

P1

q1

S1

Q2

LRS

CONSTANT-COST INDUSTRY

(milllions)(thousands)

$/q

$/q

Perfectly Competitive Firm

Perfectly Competitive Industry

MC

LATC

S0

P0

Q0q00

ATC

D0

New Short-Run Equilibrium: P=AR=MR=MC>ATC>LATC

D1

Q1

P1

q1

(milllions)(thousands)

$/q

$/q

Perfectly Competitive Firm

Perfectly Competitive Industry

MC0

LATC0

S0

P0

Q0q00

ATC0

D0

New Long-Run Equilibrium: Entry Causes Price to Fall and Costs to Rise

D1

Q1

P1

q1

S1

Q2

LATC1

ATC1

MC1

q2

P2

Costs go up.

Price goes down

(milllions)(thousands)

$/q

$/q

Perfectly Competitive Firm

Perfectly Competitive Industry

MC0

LATC0

S0

P0

Q0q00

ATC0

D0

D1

Q1

P1

q1

S1

Q2

LATC1

ATC1

MC1

q2

P2

Costs go up.

Price goes down

LRS

INCREASING-COST INDUSTRY

(milllions)(thousands)

$/q

$/q

Perfectly CompetitiveFirm

Perfectly CompetitiveIndustry

MC

LATC

S0

P0

Q0q00

ATC

D0

(milllions)(thousands)

$/q

$/q

Perfectly CompetitiveFirm

Perfectly CompetitiveIndustry

MC

LATC

S0

P0

Q0q00

ATC

D0

D1

Q1

P1

q1

(milllions)(thousands)

$/q

$/q

Perfectly Competitive Firm

Perfectly Competitive Industry

MC0

LATC0 S0

P0

Q0q00

ATC0

D0

D1

Q1

P1

q1

LATC1

ATC1

S1

Q2

P2

MC1

New Long-Run Equilibrium: Entry Causes Price to Fall and Costs to Fall

(milllions)(thousands)

$/q

$/q

Perfectly CompetitiveFirm

Perfectly CompetitiveIndustry

MC0LATC0

S0

P0

Q0q00

ATC0

D0

D1

Q1

P1

q1

LATC1

ATC1

MC1

S1

P2

Q2

(milllions)(thousands)

$/q

$/q

Perfectly CompetitiveFirm

Perfectly CompetitiveIndustry

MC0LATC0

S0

P0

Q0q00

ATC0

D0

D1

Q1

P1

q1

LATC1

ATC1

MC1

S1

P2

Q2

Decreasing-Cost Industry