个人如何做出决策:
1. tradeoff: People face tradeoffs.
2. opportunity cost: The cost of something is what you give up to get it.
3. margin: Rational people think at the margin.
4. incentive: People respond to incentives.
人们如何相互作用:
1. trade: Trade can make everyone better off.
2. markets: Markets are usually a good way to organize economic activity.
3. goverments: Goverments can sometimes improve market outcomes.
整体经济如何运行:
1. production: The standard of living depends on a country's production.
2. money: Price rise when the goverment prints too much money.
3. inflation and unemployment: Socity faces a short-run tradeoff between inflation and unemployment.