The market mechanism, market failure and government intervention in markets

Welcome to Economics 7135: Markets and Why They Sometimes Fail

In this chapter, we are going to explore how the world around us decides what to make and who gets it. Most of the time, the "market" does a great job of this using prices. But sometimes, the market gets it wrong—this is what economists call Market Failure. When that happens, the government might step in to try and fix things. Don't worry if this seems a bit abstract at first; we’ll use plenty of everyday examples to make it clear!

1. The Price Mechanism: How Markets Allocate Resources

In a market economy, there isn't a "boss" telling everyone what to do. Instead, the Price Mechanism acts like an invisible signal that coordinates millions of people. It has three main jobs, which you can remember with the acronym SIR:

• Signalling function: Prices provide information. If the price of strawberries goes up, it signals to farmers that people want more strawberries. It also signals to consumers that strawberries are currently scarce.
• Incentive function: Higher prices create an incentive for firms to produce more because they can make more profit. On the flip side, high prices discourage consumers from buying.
• Rationing function: When there isn't enough of a good to go around (scarcity), the price rises until only those who can afford it and value it most buy it. The good is "rationed" to those willing to pay the market price.

Quick Review: The price mechanism is how the basic economic problem (scarcity) is solved without government intervention. It tells us what to produce, how to produce it, and for whom.

2. What is Market Failure?

Market Failure happens whenever the market leads to a misallocation of resources. This just means the "wrong" amount of something is being produced or consumed, or it's not being produced at all.

Economists talk about two types:
• Complete Market Failure: This results in a missing market. The market simply does not provide the good at all (like national defense).
• Partial Market Failure: A market exists, but it produces the wrong quantity or at the wrong price (like too much pollution or too little healthcare).

Takeaway: Market failure isn't about a business "going bust"; it’s about the whole market failing to provide the best outcome for society.

3. Public Goods vs. Private Goods

Most things we buy (like shoes or apples) are Private Goods. They are rival (if I eat the apple, you can't) and excludable (if you don't pay, the shopkeeper won't give it to you).

Pure Public Goods are the opposite. They have two special features:
1. Non-excludable: You can't stop someone from using it once it's provided (e.g., a street lamp).
2. Non-rival: One person using it doesn't reduce the amount left for others (e.g., a beautiful sunset or a lighthouse signal).

The Free-Rider Problem: Because public goods are non-excludable, people have no incentive to pay for them—they can just "free-ride" on others' payments. This leads to a missing market because private firms can't make a profit, so the government usually has to provide them.

Note: Some goods are Quasi-public goods. They are near-public but can become excludable (like a toll road) or rival (like a crowded park). Technological changes, like digital TV encryption, have turned some public goods (broadcasts) into private ones!

4. Externalities: The "Spillover" Effects

Sometimes, when you buy or make something, it affects a third party who wasn't involved in the deal. These are Externalities. They cause a gap between private costs/benefits and social costs/benefits.

• Negative Externalities: These are "bad" spillovers (like pollution from a factory). Because the firm doesn't pay for the pollution, their costs are too low. This leads to over-production and over-consumption.
• Positive Externalities: These are "good" spillovers (like getting a flu jab). By getting vaccinated, you protect others, but you probably only thought about your own health. This leads to under-consumption and under-production.

Common Mistake: Don't confuse "externalities" with the price. An externality is an effect on a third party (like a neighbor), not the buyer or seller.

5. Merit and Demerit Goods

This is where Value Judgements come in—opinions on what is "good" or "bad" for us.
• Merit Goods: These are goods that the government thinks we should consume more of because they are better for us than we realize (like education or healthy food). They often have positive externalities and suffer from imperfect information (people don't know the long-term benefits).
• Demerit Goods: These are goods thought to be harmful (like junk food or cigarettes). We often consume too many because we ignore the long-term damage or the negative externalities they cause.

6. Information Gaps and Other Imperfections

For a market to work perfectly, everyone needs perfect information. In the real world, we have:
• Asymmetric Information: This is when one person in a transaction knows more than the other. Example: A used-car dealer knows if the car is a "lemon," but the buyer doesn't.
• Monopoly Power: When one firm dominates a market, they can charge high prices and restrict supply, leading to a misallocation of resources.
• Immobility of Factors of Production: If workers can't move to where the jobs are (geographical immobility) or don't have the right skills (occupational immobility), the market fails to use resources efficiently.

Did you know? Inequity (unfairness) in income and wealth is also considered a market failure. If some people are very poor, the market ignores their needs because they lack "effective demand" (money to spend).

7. Government Intervention: The Toolkit

When markets fail, the government steps in using several "tools":

• Indirect Taxes: Taxes on demerit goods (like a sugar tax) to increase the price and reduce consumption.
• Subsidies: Payments to firms to lower costs and encourage more production of merit goods (like solar panels).
• Price Controls: Maximum prices (caps) to keep essentials like rent affordable, or Minimum prices to discourage demerit goods (like alcohol).
• State Provision: The government provides the good directly using tax money (like the NHS or street lighting).
• Regulation: Rules and laws (like banning smoking in public places or sets of environmental standards for factories).

Quick Review: The goal of intervention is to move the market toward a more "socially optimum" level of production.

8. Government Failure: When the Cure is Worse Than the Disease

Just because a market fails doesn't mean the government will automatically fix it. Government Failure happens when government intervention leads to an even worse misallocation of resources.

Why does it happen?
• Unintended Consequences: A tax on cigarettes might lead to more smuggling and black markets.
• Excessive Administrative Costs: Sometimes the cost of running a scheme (like a new regulation department) is more than the benefit it provides.
• Information Gaps: Governments might not have all the facts, leading them to set taxes too high or subsidies too low.
• Conflicting Objectives: Politicians might make decisions to win votes rather than to help the economy (e.g., building a bridge that isn't needed).

Key Takeaway: Intervention is a balancing act. Economists must evaluate whether the benefits of fixing a market failure outweigh the risks of a government failure.