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Economics for Managers

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Week 5: Monopoly and Imperfect Competition – Part A
Text References Ch.10 Monopoly & its Regulation pp. 221 – 244 Ch.15 Monopolistic Competition pp. 339 – 356 Ch.16 Oligopoly games and Strategies pp. 357 – 380

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Market Structure

Perfect Competition

Monopolistic Competition

Oligopoly

Duopoly

Cartel

Monopoly

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Market Structure
Perfect Competition
Sell Side • • Perfect Competition • Duopoly • Monopoly • Example One large seller controls market – Telstra in 1990 2 Sellers – Broome Camel Tours, AMD & Intel , Qantas & Ansett

Imperfect Competition
Buy Side • Monopsony (monopsonist) • Duopsony (duopsonist) • Example Where large buyer controls the market 2 buyers of product





Oligopoly



More than two • Oligopsony sellers – (oligopsonist) University Education, Car manufacturers, Banks, Fast Food



Several large buyers control the market – i.e. Fast Food industry controls the meat market



Monopolistic Competition ‐ sell side



Small to Medium sized businesses
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Types of Markets: Perfect and Imperfect
Perfect Competition has the following distinguishing characteristics:
• • • • Many Buyers & Many Sellers Products are Homogeneous Perfect knowledge of competitors activities ‐ i.e. symmetrical knowledge Firms are Price Takers not Price Maker • • • • Freedom of Entry and Freedom to Exit All PC firms face the same costs Price = Demand = AR= MR. Firms make an economic profit Or an economic loss



No barriers to entry

Examples: The spot market for crude oil & spot market for Henry Hub natural gas. Both markets tend to approximate perfect competitive behaviour.

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Market Structure
Perfect Competition
Sell Side • • Perfect Competition • Duopoly • Monopoly • Example One large seller controls market

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