【公开课】麻省理工学院：微观经济学（全25讲）

I. Budget constraints（Limited resources）

Construction 🔗

The more is better

📝Budget＝Income（没有Saving OR Borrowing）

📝Assume Y have given by parents to spend for

📝P是买Pizza的数量 C是买Cookie的数量

美国Household家眷

例子（上面这个时间轴）

Opportunity Cost机会成本

Slope = Marginal Rate of Substitution

--choices with budget constraints

II. Weight Watchers (Weight loss)

Do: set up budget constraint & ask you follow it

Loss weight--dieting X

eg. set up point values to every good you might consume

Example

budget: 30 points

• M Lunch--blown the whole budget for the day

1 point+14 points(mac)+10 points(fries)+6 points(coke)

• A Lunch[liar]--12 points(10 nugget)+1 point(apple slices)+Diet Coke(0 point) Dinner(13 points)

Shocking Budget Constraint

comparative statics

• change prices

pivot inward dots&stuff

opportunity set: the set of choices avaiable to you given your income and market prices.(Area)

Constrained Choices

当tangent和Indifference curve 越接近, IC就越高

Utility function& Indifference curve & Opportunity cost⬇️（考intuition直觉）

derivatives（derivation）⬇️

目的：Marginal Benefit＝Marginal Cost

Poverty Line

SNAP（N是nutrition）

debit card from government to buy food

rigmarole繁琐复杂？

Cash transfer

给个debit⬇️只能用在food上的钱和stamp没差别

normative economics: paternalistic家长式作风的

cocaine可卡因

taxpayers goal: help poor people

contend竞争v.

相关的两个问题