1.3 market failure

define the term marginal private benefit (MPB)

refers to the additional benefit received by an individual or firm from consuming or producing one more unit of a good or service.

define the term “Marginal external benefit” MEB

is the additional benefit to third parties from the consumption or production of one more unit of a good or service.

Define “marginal social benefit” MSB

is the total benefit to society from the consumption or production of one more unit of a good or service, including both private and external benefits.

define "Marginal private cost" (MPC)

refers to the additional cost incurred by a producer or consumer from producing or consuming one more unit of a good or service.

Marginal External Cost (MEC)

refers to the additional cost imposed on third parties or society from the production or consumption of one more unit of a good or service, not borne by them

Marginal Social Cost (MSC)

is the total cost to society of producing one more unit of a good or service, including both the Marginal Private Cost (MPC) and the Marginal External Cost (MEC).

define the concept "third party"

refers to any individual or group that is not directly involved in an economic transaction but is affected by its outcomes. they experience externalities

differences between a consumption externality and a production externality

A consumption externality occurs when the consumption of a good affects third parties (e.g., secondhand smoke or the benefits of education).

A production externality occurs when the production of a good affects third parties (e.g., pollution from factories or technological advancements).

Define the term "Positive externality"

When a good causes external benefits to a third party from the consumption or production of it

Define the term “Non-rival”

"Non-rival" refers to a good or service where one person's consumption does not affect another person's ability to consume it.

Define “non-excludable”

"Non-excludable" means that no one can be prevented from using a good or service.

difference between a private good and a public good

A private good is both excludable and rivalrous, meaning people can be prevented from using it, and one person's use reduces its availability to others (e.g., a sandwich).

A public good is non-excludable and non-rivalrous, meaning everyone can use it, and one person's use doesn't reduce its availability to others (e.g., clean air).

Explain the free rider problem

The free rider problem occurs when people can benefit from a good or service without paying for it, leading to underproduction or underfunding of that good since there's little incentive for individuals to contribute.

Indirect taxes

• Used to correct negative externalities

• Effect: Increase private cost → reduce output

• Diagram: Shift in MPC → closer to MSC

• Evaluation:

  • Inelastic demand → ineffective

  • Can be regressive

  • Revenue for government

Subsidies

• Used to encourage positive externalities

• Lowers cost of production → increase consumption

• Diagram: Shift MPC rightward toward MSC

• Evaluation:

  • Expensive

  • Government failure possible

  • Difficult to value external benefit

what is government failure

• When intervention worsens resource allocation

• Leads to greater net welfare loss

real world examples

• Sugar tax (UK)

• Congestion charge (London)

• COVID vaccines (positive externality)

• Smoking bans (negative externality)

asymmetric information

Asymmetric information occurs when one party in an economic transaction has more or better information than the other.

evaluation of government intervention

• Effectiveness: Depends on PED, government knowledge

• Efficiency: Is it value for money?

• Equity: Who gains/loses?

• Long-term vs short-term effects

market failure

Market failure occurs when the free market fails to allocate resources efficiently, leading to a net welfare loss.

why arent public goods provided by the free market

Public goods are not provided by the free market because of the free rider problem – individuals can benefit without paying, so firms have no incentive to supply them as they can’t make a profit.

information gaps

An information gap occurs when consumers or producers lack full knowledge to make rational decisions.

How can indirect taxation help correct market failure from negative externalities?

Indirect taxes (e.g. on cigarettes or petrol) increase the private cost of consumption or production reducing output to the socially optimal level and internalising the externality.

why may a subsidy lead to government failure

Subsidies may lead to government failure if they are misallocated (e.g. to inefficient firms), create dependency, or if the opportunity cost is too high.

negative production externality

positive production externality