Characteristics of goods: excludability and rivalry

Economists classify goods based on two key features: excludability and rivalry.

Excludability

A good is excludable if it is possible to prevent certain individuals from accessing or using it. In contrast, a non-excludable good is one that is available to everyone, with no practical way to restrict access.

Rivalry

A good is rival if its consumption by one person reduces the amount available for others. A non-rival good can be consumed by multiple people simultaneously without diminishing its availability to any individual.

Types of goods: private, public, quasi-public, and free goods

Goods are categorised according to their levels of excludability and rivalry, which influences whether they are provided by markets or governments.

Private goods

Private goods are both excludable and rival, meaning they are scarce and require resources to produce. As a result, they carry a price and are typically provided through markets. Individuals or businesses purchase them for personal use.

Examples of private goods:

• Personalised gadgets
• Food items from shops
• Apparel
• Vehicle petrol

Public goods

Public goods are non-excludable and non-rival, so everyone can benefit without reducing availability for others. Pure public goods fully meet these criteria and are often provided by governments due to market failure in their provision.

Examples of public goods:

• Military protection
• Lighthouses for ships
• Public alert systems

Quasi-public goods

Quasi-public goods partially meet the criteria for public goods, as they are either excludable but non-rival, or non-excludable but rival.

Examples of quasi-public goods:

• Paid online video platforms (non-rival but excludable through subscriptions)
• Open-access parks (non-excludable but potentially rival during busy periods)

Free goods

Free goods involve no opportunity cost, as they are abundant and not scarce. They require no production inputs and have no market price.

Examples of free goods:

• Clean air in remote locations
• Natural water sources in isolated areas
• Wild fruits that grow without cultivation

The free rider problem associated with public goods

The free rider problem occurs with non-excludable goods, where individuals can benefit without contributing to the costs. This leads to under-provision by markets, as people avoid paying while still enjoying the advantages.

Consequences of the free rider problem:

• Reduced incentives for private providers, since they cannot charge all users
• Potential reliance on government funding through taxes to ensure provision
• Inefficiency in resource allocation, as the true demand is hard to gauge

Merit and demerit goods and information failure

Merit and demerit goods arise from market failures where consumption levels do not reflect societal benefits or harms, often due to information gaps or other factors.

Merit goods

Merit goods are products considered beneficial but under-consumed in free markets. Governments may intervene to encourage their use through subsidies or provision.

Examples of merit goods:

• Routine health checks
• Schooling initiatives

Reasons for under-consumption of merit goods:

• Information failure - Consumers may not fully understand the long-term advantages.
• Low income - Even if benefits are recognised, affordability issues prevent purchase.

Benefits of specific merit goods:

• Education - Improves personal outcomes like earnings and job opportunities, while boosting economic productivity, growth, and global competitiveness.
• Healthcare - Enhances individual well-being and prevents under-use among lower-income groups, supporting a productive workforce.

Demerit goods

Demerit goods are products viewed as harmful but over-consumed in markets. Interventions like taxes or regulations aim to reduce their intake.

Examples of demerit goods:

• Sugary snacks
• Habit-forming products

Information failure

Information failure happens when consumers lack complete or accurate details about a product's effects, leading to suboptimal choices.

Examples of information failure:

• Unawareness of positive or negative impacts from using a product
• Misleading promotions that encourage excessive consumption
• Deceptive labels or claims on packaging
• Producers having more knowledge than buyers, creating asymmetry

Debate on merit and demerit goods

Some economists question the concept of merit and demerit goods, arguing that individuals should decide their own consumption rather than governments. The core issue is determining who judges what is beneficial or harmful, raising questions about personal freedom versus societal intervention.