INTERMEDIATE MICROECONOMICS

Shanghai Jiao Tong University

(ECON 2404)I teach this course in Fall semesters to undergraduate students at SJTU. It is based on Hal Varian's textbook (9th Edition) with added rigor by means of formal definitions and mathematical proofs. Please let me know if you find typos, thank you!

If you run into issues accessing/downloading the files, check this for possible solutions or contact RC.

**Fall 2023**: This course is ongoing and slides are actively updated, please make sure you have the latest version. Our semester consists of 31 (1.5h) lectures, among them 28 are used to cover the following topics, 2 are reserved for midterm and final exam reviews, and 1 is for backup. Students should check Canvas for syllabus, course policies, exam times, and TAs' contact information. Hope you have a great semester.PART I

**Introduction**about this course; first look at rationality, equilibrium and efficiency; in-class illustration of a market (CH 1)

**Decision Theory**preference relations; utility representation theorem; cardinal vs ordinal utility; convex preferences (CH 3 & 4)

utility maximization under budget constraints; indifference curves; marginal rate of substitutions and price ratio (CH 2 & 5)

Lagrange method; well-behaved preferences and sufficient conditions; various examples (CH 5)

weak/strong axiom of revealed preferences; rationalizable datasets; representation theorems (CH 7)

system of prices and income; SAPR and well-behaved preferences; checking weak/strong axiom; applications (CH 7)

**Demand Analysis**Marshallian demand; price/income changes; Giffen goods; Engle curves; homothetic preferences (CH 6)

Slutsky's decomposition; income effects and substitution effects (CH 8)

buying and selling; ordinary income effect; endowment income effect; application in labor supply (CH 9)

visualizing consumer surplus; quasi-linear utility and dollar measure; compensating and equivalent variations (CH 14)

**Partial Equilibrium**aggregate demand; representative agent; weak axiom; elasticities; revenue maximization (CH 15)

demand, supply, and equilibrium; taxation and subsidy; tax incidence; implications on welfare (CH 16)

PART II

**Neoclassical Firms**production; marginal rate of technical substitution; return-to-scale; marginal revenue and marginal cost (CH 19 & 20)

Cost minimization; Lagrange method; average cost; marginal cost; long-run/short-run; variable/fixed cost (CH 21 & 22)

supply curve; long-run vs short-run profit; producer surplus (CH 23)

cost data and supply curve; industry/aggregate supply; long-run equilibrium; free entry; economic profit and economic rent (CH 24)

**Market Power**price as a decision variable; market power; tatal surplus; efficient output; markup; dead-weight loss (CH 25)

markup, elasticities, and Lerner index; price control and price ceiling; marginal revenue product; factors supply (CH 25 & 27)

non-linear pricing; 1st degree price discrimination; surplus extraction; 3rd degree price discrimination; two-part tariffs (CH 26)

2nd degree price discrimination; Riley Maskin screening, menu design and incentive compatibility (CH 26)

**Game Theory**pure strategies; simultaneous move; Nash equilibrium; Nash bargaining; dominant strategy equilibrium (CH 29 & 28)

Cournot competition; Bertrand competition; Vickrey (second-price) auction (CH 29 & 28)

randomization; expected utility; mixed strategy NE; best response correspondences; existence of NE; symmetric equilibrium (CH 30)

complete contingent plan; backward induction; subgame perfect NE; non-credible threat; various applications (CH 29 & 30 & 28 & 27)

types; adverse selection; Akerlof market for lemons; moral hazard; work or shirk; signaling; Spence education model (CH 38)

**General Equilibrium**Walrasian equilibrium & existence; Pareto optimal allocations; First & Second Welfare Theorems; Edgeworth box, contract curve, core allocations (CH 32)

27: Exchange 2 & Externalities

utility functions under externalities; property rights; Coase conjecture; production externalities; tragedy of the commons (CH 35)

Pareto optimal level of public goods; uniqueness under quasi-linear preferences; provision decisions (CH 37)

Other Materials

**Blue Book**(pin on Canvas)

**Black Book**(pin on Canvas)

FAQs

**Office hour**I have year-round office hour (even when I am not teaching). Please check my homepage: www.xzlim.com

**Letter for PhD applications**In a typical year, I write letters for at most 3 students who apply to top 30 econ PhD programs, usually the best students who took my class and continued to interact with me

**Letter for Master's or job applications**You automatically qualify for a letter if you attend class and receive a grade of 80+. The degree of personalization depends on how well I know you

**Auditing the class**Antai majors/minors are welcomed. Non-Antai students should seek permission via email (up to 20% of class capacity)

**Other intermediate micro classes**Exams are the same (barring language differences), but my lectures emphasize rigorous introduction of concepts and the use of mathematical proofs. Please choose wisely!

**TAs**LU Feifei (2021), FENG Xuechun (2022), QI Rui (2022), LIU Xingwen (2023), SU Tan (2023)

**References**(1) Hal R. Varian. Intermediate Microeconomics: A Modern Approach (9th Edition). W. W. Norton & Company, 2014. (2, a.k.a "Blue Book") 钟根元, 陈志洪. 中级微观经济学学习指南(第四版). 上海交通大学出版社, 2012. (3, a.k.a. "Black Book") 钟根元, 陈志洪. 中级微观经济学. 上海交通大学出版社, 2020. (4) Andreu Mas-Colell, Michael Dennis Whinston, and Jerry R. Green. Microeconomic Theory. Oxford University Press, 1995. (5) Martin J. Osborne and Ariel Rubinstein, Models in Microeconomic Theory. Open Book Publishers, 2020.

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