3. Government microeconomy intervention

Because public goods are non-rival and non-excludable, individuals can benefit without paying, so private markets may underprovide or not provide them at all.

Government can finance provision through taxation, direct production or contracts, but must estimate demand, cost and the socially valuable quantity. Provision still has an opportunity cost.

A publicly funded flood-warning system can protect many households simultaneously; charging each household separately may fail because people can wait for others to contribute.

Public provision does not mean unlimited free supply or zero cost; scarce labour and finance are still used.

Merit goods may be under-consumed and demerit goods over-consumed when consumers lack relevant information about benefits or harms. Policy aims to narrow the gap between private choices and social welfare.

Information campaigns, subsidies, taxes, regulation and direct provision can be combined. Each has costs, enforcement issues and possible unintended effects.

Subsidised vaccinations and clear risk information can raise uptake; excise taxes and age restrictions can reduce tobacco consumption, but neither guarantees the exact efficient quantity.

Policy should not be justified by labelling a good “good” or “bad” alone; identify the information failure and predicted response.

A maximum price set below equilibrium is a price ceiling that can create excess demand; a minimum price set above equilibrium is a price floor that can create excess supply.

The effect depends on whether the control is binding. A non-binding ceiling above equilibrium or floor below it leaves the market outcome unchanged; enforcement and allocation mechanisms determine who gains access.

A binding rent ceiling may reduce the price paid by some tenants but create a shortage and non-price allocation; an agricultural support price can create unsold surplus.

A legal price is not automatically binding, and a price ceiling does not guarantee every willing buyer can obtain the good.

An indirect tax creates a wedge between the price paid by consumers and the price received by producers. Incidence is the share of the burden borne by each side, determined largely by relative elasticities.

The less elastic side has fewer alternatives and tends to bear more of the tax through a larger price change or lower net receipt. The legal payer need not bear most of the economic burden.

A tax on a product with inelastic demand may raise the consumer price substantially; with elastic demand, producers may absorb more through a lower received price.

“The firm pays the tax” describes collection, not necessarily final incidence.

A subsidy is a payment to producers or consumers that lowers the effective cost of supplying or buying a good. It shifts supply or demand and creates a gap between the market price and the net price received or paid.

The benefit is shared according to relative elasticities, while government expenditure is funded from scarce resources. A subsidy can increase output but may create overproduction or fiscal cost.

A per-unit subsidy for public transport can lower the fare and raise passenger numbers; the operator receives the fare plus the subsidy.

A subsidy is not automatically received entirely by producers or consumers; incidence depends on market responsiveness.

Direct provision means the government supplies a good or service itself, often using tax revenue or public agencies, rather than relying only on private purchases.

It can address public-good free riding, merit-good under-consumption or equity goals, but provision still has opportunity costs and may involve waiting, rationing or inefficiency.

A state may provide vaccination clinics or flood defence directly so access does not depend entirely on individual willingness or ability to pay.

Public provision does not mean unlimited supply or zero economic cost; inputs remain scarce.

A maximum price below equilibrium is a binding ceiling that can create a shortage; a minimum price above equilibrium is a binding floor that can create a surplus.

If the legal bound does not cross equilibrium it is non-binding. Once binding, allocation may occur through queues, rationing, unsold stocks, government purchases or black markets.

A binding rent ceiling may increase demand for apartments while reducing supply; an agricultural floor may leave the government buying excess output.

Do not label a price control binding without comparing it with equilibrium, and do not assume the legal price alone determines who receives the good.

A buffer stock scheme sets a target price or price band. An agency buys surplus when market price falls below the target and sells stock when price rises above it.

The scheme requires storage, finance and a credible target. It can stabilise producer income but risks unsold spoilage, high costs or running out of stock if the target is unrealistic.

To support a crop price, the agency buys harvest surpluses in a bumper year and releases stored grain after a poor harvest.

Buying surplus does not make it disappear economically; storage and disposal costs remain.

Information provision gives consumers or producers evidence about quality, risks, benefits or costs so choices better reflect true private and social consequences.

It may involve labels, warnings, public campaigns, testing standards or disclosure rules. Effectiveness depends on credibility, comprehension, attention and whether behaviour is habit-forming.

Nutrition labels can help consumers compare products; clear vaccine information may raise uptake when uncertainty, not price, is the main barrier.

Providing information does not guarantee rational behaviour or remove all market failure; it changes information, not income or preferences.

Income is money or benefits received over a period, such as wages per month. Wealth is the value of assets owned at a point in time, such as property, savings and shares, minus liabilities.

Income can add to wealth through saving, while wealth can generate income through rent, interest or dividends. A person can have high income but low wealth, or low current income but substantial assets.

A graduate earning £40,000 a year has income; a homeowner’s house and pension fund form part of wealth.

Income is not “how much someone owns” and wealth is not simply one year’s earnings.

The Gini coefficient measures inequality in a distribution. A value of 0 represents complete equality; a value closer to 1 represents greater concentration in the hands of fewer people.

It can be derived from the Lorenz curve, but the same coefficient can hide different distribution shapes and does not identify absolute income levels.

Country A can have a lower Gini than Country B but still have lower average incomes; the coefficient compares distribution, not prosperity.

A falling Gini means inequality fell according to that measure, not that every household became richer or that poverty disappeared.

Inequality can arise from differences in education and skills, labour-market bargaining power, inheritance and asset ownership, discrimination, technology, tax systems and access to opportunities.

These causes interact: a family with assets can finance education, while unequal schooling can shape future income. Distinguish a cause from an observed correlation.

Automation may raise demand for skilled labour and returns to capital while reducing demand for routine work, widening some income gaps.

No single cause explains all inequality; country context, time period and the chosen income/wealth measure matter.

Governments redistribute income and wealth through progressive taxes, benefits, pensions, minimum wages, education, health care and other public services.

Policies can reduce inequality and improve opportunity, but may affect incentives, administrative cost, government finances and the distribution between current and future generations.

A progressive income tax combined with targeted benefits can raise the disposable income of low-income households; funding and behavioural responses determine the net effect.

Redistribution is not automatically costless or perfectly targeted; evaluate who pays, who receives and what changes in behaviour.