问题:生产者如何做出生产决策 目标:生产者均衡(利润最大化) 理论:生产理论、成本理论

5. Oligopoly Oligopoly: Small number of firms: Firms depend on each other. Identical products: Firms jointly face a downward sloping industry demand No entry: Long-run positive profits are possible

Chapter Six Monopoly : Market Power 垄断：市场力 Chapter 7 Monopolistic Competition (垄断竞争市场) Chapter 8 Oligopoly (寡头市场) Chapter 9 Game Theory

Optimization See Sydsaeter(2005, Chapters 2, 3)and Chiang(1984, Chapters 9, 11, 12 and 21) Positive definite matrix Definite matrices are directly related to optimization. A symmetric matrix A is positive semi- definite(A≥0) if rAr≥0,Vx; positive definite(A>0)

Content Pure exchange system The existence of Walrasian equilibrium The first theorem of welfare economics The second theorem of welfare economics Exchange with production

Content Public goods Subscription Efficient provision of public goods Public choice EXternality What's externality? How to solute it? What's the efficient condition with externality

Content Competitive equilibrium Local analysis Omplete compete market Monopoly

Summary textbook Varian, Hal R, 1992, Microeconomics Analysis, 3rd ed Mas-Colella m Whinston and j, green 1995, microeconomics Theory assignments

Preference and Choice Content: Preference and rationality The rule of choice Budget Demand function WAand demanded law

Cost Minimization Content Definitions Properties of cost function WACM Some forms of cost functions