Welcome to the World of Public Goods!
In this chapter, we are exploring a fascinating corner of Market Failure. Have you ever wondered why you don't have to put a coin in a slot to make a streetlamp turn on? Or why the police protect everyone in a neighborhood, not just the people who pay the most tax?
We are going to learn about Public Goods. These are special types of products that the normal "free market" (where people buy and sell things for profit) struggles to provide. Don't worry if this seems a bit abstract at first—we’ll use plenty of everyday examples to make it stick!
1. Private Goods vs. Public Goods
To understand what a public good is, we first need to look at what most things in our lives are: Private Goods. Most things you buy, like a Mars bar or a pair of trainers, are private goods.
The Two Big Tests
Economists use two "tests" to decide if something is a private good or a public good: Excludability and Rivalry.
1. Excludability: Can you stop someone from using it if they don't pay?
• In a Private Good: Yes. If you don't pay for the Mars bar, the shopkeeper won't give it to you. It is excludable.
• In a Public Good: No. Once it is provided, you can't really stop people from using it. It is non-excludable.
2. Rivalry: If one person uses it, is there less left for everyone else?
• In a Private Good: Yes. If you eat that Mars bar, nobody else can eat it. It is rivalrous.
• In a Public Good: No. If you look at a lighthouse or breathe clean air, it doesn't stop the person next to you from doing the same. It is non-rivalrous.
Quick Review:
• Private Goods: Excludable and Rivalrous.
• Public Goods: Non-excludable and Non-rivalrous.
Key Takeaway: A pure public good is something that everyone can use at the same time, and you can't stop people from "joining in" for free.
2. The "Free Rider" Problem
This is the heart of why public goods cause Market Failure.
Imagine a street where it’s very dark at night. All the neighbors want a streetlamp. A private company offers to install one for £500. However, because a streetlamp is non-excludable, once it’s turned on, everyone on the street gets the light, even if they didn't pay a penny toward it.
Because of this, most people will wait for someone else to pay for it so they can use it for free. These people are called Free Riders.
The Problem for Firms:
If a private firm tries to sell a public good, they realize they can't charge people for it because of the free riders. If you can't charge a price, you can't make a profit. If there is no profit, private firms simply won't produce the good at all!
Analogy: Imagine a group project at school where everyone gets the same grade regardless of how much work they do. Some students might do nothing (the "Free Riders") and hope others do the work. If everyone thinks this way, the project never gets done!
Did you know? Because the market fails to provide these goods, economists call this a missing market.
Key Takeaway: The free rider problem means that in a free market, public goods will be under-provided or not provided at all, leading to market failure.
3. Why the Government Steps In
Since these goods (like national defense, street lighting, and lighthouses) are vital for society but private firms won't make them, the Government has to step in. This is known as State Provision.
The government pays for these goods using tax revenue. This solves the free rider problem because everyone is forced to pay (via taxes), and everyone gets to benefit.
Common Mistake to Avoid:
Don't confuse a "Public Good" with "Publicly Provided." For example, Healthcare and Education are often provided by the government, but they aren't technically "pure public goods." Why? Because they are actually rivalrous (if a doctor is seeing one patient, they can't see another) and excludable (you can be turned away from a private hospital). These are often called merit goods, not public goods!
4. Summary Table for Revision
Characteristic: Excludability
• Private Good: Excludable (Price prevents use)
• Public Good: Non-excludable (Free riders can use it)
Characteristic: Rivalry
• Private Good: Rivalrous (One person's use reduces availability)
• Public Good: Non-rivalrous (One person's use does not reduce availability)
Characteristic: Provision
• Private Good: Provided by the Market (Firms)
• Public Good: Provided by the State (Government)
Memory Aid: The "Two Non-s"
Just remember that Public Goods are the "Double-Non" goods: Non-excludable and Non-rivalrous!
Quick Review Questions (Check your progress!):
1. Why is a firework display in a city center considered a public good? (Hint: Think about people watching from their balconies).
2. What is a "free rider"?
3. Why does the "free rider" problem lead to a "missing market"?
Great job! You've just mastered one of the key causes of market failure. Next time you see a police car or a streetlamp, you'll know exactly why the government is the one paying for it!