1. Core Characteristics: Rivalry and Excludability★☆☆☆☆⏱ 3 min
All goods can be classified based on two core characteristics that determine how they are allocated by markets and governments: rivalry (rivalness) and excludability. All classification of goods starts with assessing these two properties.
2. Private Goods: Definition and Market Allocation★★☆☆☆⏱ 3 min
Pure private goods sit at one end of the classification spectrum, opposite pure public goods. They fully satisfy both conditions of rivalry and excludability, and are the most common type of good in a market economy.
Everyday consumer goods (food, clothing, electronics) are private goods
Services such as haircuts, private tuition, and restaurant meals are private goods
Private goods are typically efficiently allocated by the free market, because producers can charge consumers who benefit, eliminating the free rider problem
3. Quasi-Public Goods: Classification and Market Failure★★★☆☆⏱ 4 min
Quasi-public goods (also called impure public goods) fall between pure private and pure public goods on the classification spectrum. They do not fully satisfy the conditions for either category, leading to partial market failure.
The most common type of quasi-public good is non-excludable (or costly to exclude) but becomes rival when congested. For example, an uncongested public road is non-rival: adding one more car does not slow others down, but at peak times it becomes congested, so it becomes rival. Another type is excludable but non-rival, such as a streaming service subscription: one user watching does not reduce availability for others, but non-subscribers can be excluded.
Common Pitfalls
Why: CIE markers require you to reference both characteristics to get full marks for classification
Why: Classification depends on characteristics, not which sector provides the good
Why: Pure public goods are fully non-rival and non-excludable, while quasi-public goods only have partial characteristics
Why: Private provision of quasi-public goods is possible when exclusion is feasible