Economics Study Guide: Public Goods, Common Pool Resources, and Sustainability

• Public Good vs Private Good: A public good is something everyone can use without paying (like parks or streetlights). A private good is something you have to pay for (like a chocolate bar).

• Characteristics of Public Goods:
  
  

  • Non-excludable: You can't stop people from using it. Once it's provided, everyone can benefit no matter if they paid or not.

  • Non-rivalrous: One person's use doesn't reduce how much is available for others.

• Example: A fireworks show is a public good. People who watch it for free from far away can enjoy it without taking away from those who paid to see it up close.

Market Failure

• Free-Rider Problem: Because everyone can use public goods without paying, some people might use them for free instead of paying, which is called "free-riding."

• Why Government Provides Public Goods: Since businesses can’t make money from public goods, the government steps in to provide them because they are important for society, like national defense and street lighting.

Classifying Goods

• How to Classify Goods:
  
  

  • Public Good: Non-excludable and non-rivalrous.

  • Private Good: Excludable and rivalrous.

  • Quasi-Public Good: Can be non-excludable but rivalrous, or excludable but non-rivalrous (like some parks or the internet).

Comparison of Different Goods

• Education: You usually have to pay (excludable) and it can be crowded (rivalrous) which means it’s a private good.

• Lighthouse: Available for everyone to use (not excludable) and everyone can see it without affecting others (not rivalrous) so it’s a public good.