Public Goods vs. Private Goods: Key Differences & Examples in AP Micro

📚 Quick Study Guide

🌍 Public Goods: Non-excludable (everyone can use them) and non-rivalrous (one person's use doesn't diminish availability for others). Examples: national defense, clean air. 🏛️ Private Goods: Excludable (sellers can prevent consumption if not paid for) and rivalrous (one person's consumption prevents another from consuming it). Examples: pizza, clothing. 💰 Excludability: The ability to prevent someone from using a good if they don't pay for it. 🎂 Rivalry: One person's consumption of a good diminishes its availability for others. ⚠️ Free-Rider Problem: Individuals benefit from public goods without contributing to their cost, leading to under-provision. ⚖️ Market Failure: Public goods often lead to market failure because private markets don't efficiently provide them.

Practice Quiz

1. Which of the following is the BEST example of a public good?
   1. A slice of pizza
   2. A concert ticket
   3. National defense
   4. A private tutoring session
2. What characteristic defines a good as 'non-rivalrous'?
   1. Only one person can consume it.
   2. One person's consumption prevents another from consuming it.
   3. Consumption by one person does not reduce availability for others.
   4. It is excludable.
3. Which of the following is the MOST likely result of the 'free-rider problem'?
   1. Over-provision of public goods
   2. Under-provision of public goods
   3. Efficient allocation of resources
   4. Increased consumption of private goods
4. Why do private markets often fail to provide public goods efficiently?
   1. Because public goods are too expensive to produce.
   2. Because public goods are non-excludable, leading to free-riders.
   3. Because public goods are always over-consumed.
   4. Because governments always interfere with their production.
5. A local park is typically considered what type of good?
   1. A purely private good
   2. A purely public good
   3. A common resource
   4. A club good
6. Which of the following goods is BOTH excludable and rivalrous?
   1. Clean air
   2. A crowded highway
   3. A cup of coffee
   4. A public broadcast radio program
7. What is the primary difference between a private good and a public good?
   1. Private goods are always cheaper.
   2. Public goods are non-excludable and non-rivalrous, while private goods are excludable and rivalrous.
   3. Private goods are produced by the government.
   4. Public goods are only consumed by the wealthy.