Market Failure (AQA A-Level Economics): Revision Notes
Market Failure
What is market failure?
Market failure happens when the market mechanism does not allocate resources efficiently in an economy. This means resources are distributed in a way that doesn't maximise overall economic welfare. Market failure can occur in two main ways: either the market completely fails to provide a particular good or service, or it provides the wrong quantity of that good or service.
Understanding market failure is essential because it helps explain why governments sometimes need to intervene in markets. When markets work well, they efficiently allocate scarce resources. However, when markets fail, there may be a case for government action to improve resource allocation.
Types of market failure
Market failure can be classified into different types based on the severity and nature of the failure.
Complete market failure
Complete market failure occurs when a market fails to function at all, resulting in what economists call a missing market. In this situation, there is no market for a particular good or service because the price mechanism has broken down entirely.
A missing market arises when the normal functions of prices cannot operate. For example, if there is no way for buyers and sellers to meet or communicate, or if there is no mechanism to enforce payment, then no market can exist. This is particularly common with certain types of public goods where the price mechanism simply cannot function.
Exam tip: When discussing complete market failure, always explain that it results in a missing market where the good or service is not provided at all through the market mechanism.
Remember: Missing = Complete - When a market is missing, it's complete market failure.
Partial market failure
Partial market failure is more common than complete market failure. This occurs when a market does function and the good or service is provided, but it delivers the wrong quantity. The market produces and consumes either too much or too little of the good compared to what would be socially optimal.
Partial market failure results in resource misallocation, meaning resources are not distributed in the most efficient way. This can happen in two ways:
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Over-production and over-consumption: The market provides too much of the good. This often occurs with goods that create negative externalities, such as cigarettes or pollution-causing products.
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Under-production and under-consumption: The market provides too little of the good. This typically happens with goods that generate positive externalities, such as education or healthcare.
In cases of partial market failure, the market exists and functions, but it doesn't achieve an efficient allocation of resources. The good may be too cheap (leading to over-consumption) or too expensive (leading to under-consumption).
Market failure and the price mechanism
To understand why market failure occurs, we need to examine how the price mechanism normally works and how it can break down.
The four functions of prices
In well-functioning markets, prices perform four crucial functions:
The Four Functions of Prices (SIRA):
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Signalling information: Prices provide information to buyers and sellers about market conditions. Rising prices signal that demand is high relative to supply, while falling prices indicate excess supply or weak demand.
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Creating incentives: The information signalled by relative prices creates incentives for people to change their economic behaviour. For example, rising prices encourage producers to supply more and consumers to demand less.
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Rationing demand: Prices ration demand for goods and services. When prices rise, some consumers are priced out of the market, ensuring that scarce resources go to those willing and able to pay the most.
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Allocating scarce resources: Changing relative prices allocate scarce resources away from markets with excess supply and towards markets with excess demand. This ensures resources flow to where they are most valued.
Memory aid: Remember SIRA - Signalling, Incentives, Rationing, Allocation.
When the price mechanism breaks down
When all four functions of prices perform well, markets generally work effectively and market failure is either non-existent or minimal. However, market failure occurs when one or more of these functions significantly breaks down.
Example: Market Failure with Pollution (Externalities)
Consider the case of pollution as an example of how the price mechanism breaks down:
- Firms that pollute simply dump the pollution on others without payment
- There is no market where the unwilling consumers of pollution can charge producers for the discomfort they suffer
- Because there's no price signal for the pollution, producers have no incentive to reduce it
- The lack of a market means there is no incentive for the polluter to pollute less
Result: This is market failure - the price mechanism cannot function to allocate resources efficiently when externalities are present.
Similarly, with pure public goods (which we'll explore in more detail later), the price mechanism breaks down completely. If an alternative method of provision doesn't exist, none of the public good is produced and there is complete market failure.
Consumer sovereignty vs producer sovereignty
In competitive markets where the price mechanism operates effectively, consumer sovereignty tends to prevail. This means consumers hold the most power in the market. Firms and industries that produce goods consumers are prepared to pay for survive in highly competitive markets.
However, in imperfectly competitive markets and monopoly situations, the operation of the price mechanism can lead to producer sovereignty. In these cases, firms exploit their market power and producers hold the most power in the market. This represents a form of market failure because resources are not allocated according to consumer preferences.
The price mechanism is "value neutral" - it has no regard for equality or fairness in how it distributes buying power between different income groups. This is important to remember when evaluating the effectiveness of market mechanisms.
Private goods and other types of goods
Understanding the characteristics of different types of goods helps us identify where and why market failure might occur.
What are private goods?
Most goods in the economy are private goods. These goods possess two defining characteristics that allow markets to function effectively for them.
Excludability
Private goods are excludable, which means that owners can exercise private property rights to prevent other people from using the good or consuming its benefits without payment.
Example: Excludability in a Shop
A shopkeeper can prevent people from consuming the goods on display in her shop unless they are prepared to pay. Anyone trying to take the goods without paying (shoplifters) is violating private property rights illegally.
The ability to exclude non-payers is essential for markets to function because it ensures that only those who pay can benefit from the good.
Rivalry
The second property of a pure private good is that it is rival. When one person consumes a private good, the quantity available to others diminishes. This characteristic is sometimes called diminishability.
Example: Rivalry with a Chocolate Bar
If you eat a bar of chocolate, other people cannot eat that same bar and gain its benefits. In this sense, people are rivals - when one person consumes a private good such as a sweet or a banana, the quantity available to others diminishes.
Memory aid: "If I eat it, you can't" - this helps remember the rivalry characteristic.
This rivalry characteristic is important because it means that consumption decisions have clear consequences. If someone wants to consume a rival good, they must acquire their own unit of that good, which requires payment in a market economy.
Why private goods don't cause market failure
Private goods generally don't suffer from market failure because the price mechanism can function effectively for them. Both characteristics - excludability and rivalry - support the operation of markets:
- Excludability allows sellers to charge for the good and prevent free-riding
- Rivalry ensures that consumption has clear costs and benefits that can be reflected in prices
The four functions of prices (signalling, incentives, rationing, and allocation) can all operate effectively for private goods. This explains why markets work well for most everyday goods and services like food, clothing, and consumer electronics.
Exam tip: When discussing private goods, always mention both characteristics (excludable AND rival) and explain why these characteristics allow markets to function without failure.
Memory aid: Remember ER for private goods - Excludable and Rival.
Public goods and quasi-public goods (preview)
While private goods don't typically cause market failure, other types of goods do. Public goods are the opposite of private goods - they are non-excludable and non-rival. This means the price mechanism breaks down completely for pure public goods, leading to complete market failure.
Quasi-public goods (also called merit goods in some contexts) have characteristics between private and public goods. They may be partially excludable or partially rival, which can lead to partial market failure.
These types of goods will be explored in more detail in subsequent sections, but understanding private goods first provides the foundation for recognizing why and how market failure occurs with other types of goods.
Key Points to Remember:
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Market failure occurs when the market mechanism leads to a misallocation of resources, either by completely failing to provide a good or service or by providing the wrong quantity.
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There are two types of market failure: complete market failure (resulting in a missing market) and partial market failure (resulting in over or under-production).
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Market failure is related to the breakdown of one or more of the four functions of prices: signalling, creating incentives, rationing demand, and allocating resources (remember SIRA).
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Private goods are both excludable and rival. These characteristics allow markets to function effectively for them without market failure.
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Understanding the characteristics of private goods helps identify why market failure occurs with other types of goods like public goods and goods involving externalities.