Public Goods and Market Failure

Introduction

• Market failure and non-achievement of economic efficiency occur in the case of public goods because their inherent characteristics prevent the market mechanism from allocating resources efficiently.

• Public goods are goods from which everyone derives benefits, but no one can be excluded from enjoying those benefits even if they do not pay for them.

• Examples of public goods include defence, law and order maintained by police, public street lighting, television signals, parks, flood-control projects, pollution-control projects, and lighthouses.

• When a public good is provided, its benefits are available to all:

  • Public street lighting benefits all residents of a colony, including those who do not contribute to its cost.

  • Television signals can be enjoyed by all people in a city regardless of whether they pay for them.

• Public goods possess two fundamental characteristics:

  • Non-rivalry in consumption—one person’s use of the good does not reduce its availability to others.

  • Non-excludability—everyone benefits from the good, including individuals who do not pay for it.

• Public goods are not necessarily produced by the public sector. Their classification as public goods depends solely on the above two characteristics and not on whether they are produced by the government or by private firms.

• The problem of public goods arises from their intrinsic nature, not from the identity of the producer. Because of their non-rival and non-excludable characteristics, it becomes difficult, and in some cases impossible, for the market mechanism to achieve Pareto optimality or economic efficiency.

• The existence of these characteristics causes the market mechanism to fail in allocating resources efficiently in the case of public goods, leading to market failure.

Characteristics of Public Goods

Public Goods are Non-Rival in Consumption

• To understand non-rival goods, it is first necessary to understand rival goods, which are also called private goods.

• Private goods (rival goods) are goods whose consumption by one individual reduces the quantity available for others to consume. Consumption depletes the available supply for other users.

• A good is rival when a unit consumed by one person cannot be consumed simultaneously by another person.

  • If an individual consumes a gallon of petrol, that quantity is no longer available for others.

  • If Rekha eats an apple, the same apple cannot be consumed by Karishma.

  • If Amit drinks a pack of Pepsi Cola, Bela cannot consume that same pack of Pepsi Cola.

  • Although others can obtain another unit of the good by paying its market price, the particular unit already consumed is no longer available.

• Goods such as petrol, apples, Pepsi Cola, shirts, machines, and similar commodities are rival goods because their consumption reduces their availability to others.

• Since consumption of rival goods excludes others from consuming the same unit, rival goods cannot be public goods; they are private goods.

• In contrast, public goods are non-rival in consumption, meaning one person’s consumption does not reduce the amount available for others to consume.

• Examples of public goods include national defence, parks, television signals, flood-control projects, pollution-control projects, and lighthouses.

• The non-rival nature of public goods is evident because:

  • All citizens can simultaneously enjoy the security provided by national defence.

  • All residents of a city can receive and enjoy the same television signals and programmes.

  • When a park is freely accessible, its enjoyment can be shared by all visitors.

• Consumption of a non-rival good by one individual neither excludes others from consuming it nor reduces the quantity available to them.

• The defining characteristic of public goods is that their consumption by one person can occur simultaneously with consumption by others without diminishing the benefits available to anyone else; therefore, public goods are non-rival in consumption.