3.2 Methods and effects of government intervention in markets

Learning objectives

3.2.1Indirect tax impact/incidence• Impact and incidence of specific indirect taxes 3.2.2Subsidy impact/incidence• Impact and incidence of subsidies 3.2.3Direct provision• Direct provision of goods and services 3.2.4Maximum and minimum prices• Maximum and minimum prices 3.2.5Buffer stock schemes• Buffer stock schemes 3.2.6Information provision• Provision of information

A specific indirect tax is a fixed amount per unit. On a producer-tax diagram it shifts supply vertically upward/left by exactly the tax, creating a wedge between the price consumers pay ( $P_c$ ) and the net price producers receive ( $P_p$ ).

Start at the original equilibrium price $P_e$ and quantity $Q_e$ . Shift supply up by the per-unit tax, locate the new lower quantity $Q_t$ , then read $P_c$ on demand and $P_p$ on the original supply curve at $Q_t$ . The wedge is $P_c-P_p=tax\ per\ unit$ .

consumer\ burden/unit=P_c-P_e;\quad producer\ burden/unit=P_e-P_p;\quad tax\ revenue=(P_c-P_p)Q_t

| Relative responsiveness | Larger burden | Why |\n|---|---|---|\n| Demand more inelastic than supply | Consumers | Buyers reduce quantity less, so more tax appears in $P_c$ |\n| Supply more inelastic than demand | Producers | Sellers reduce quantity less, so more tax appears as a lower $P_p$ |

The business that sends the tax to government has legal liability, not necessarily economic incidence. A tax normally raises $P_c$ by less than the full tax because producers usually absorb part of the wedge; perfectly elastic or inelastic limiting cases are exceptions.

A specific producer subsidy is a fixed government payment per unit. It shifts supply vertically downward/right by the subsidy because firms can supply each quantity at a lower market price while receiving the buyer price plus the payment.

From the original equilibrium $(P_e,Q_e)$ , shift supply down by the per-unit subsidy and locate the new higher quantity $Q_s$ . Consumers pay the lower market price $P_c$ ; producers receive the higher effective price $P_p=P_c+subsidy\ per\ unit$ .

consumer\ benefit/unit=P_e-P_c;\quad producer\ benefit/unit=P_p-P_e;\quad government\ spending=(P_p-P_c)Q_s

The less elastic side captures more of the benefit. Relatively inelastic demand creates a larger fall in consumer price; relatively inelastic supply creates a larger rise in producers' net receipt. More elastic demand and supply usually create a larger output response and therefore greater total government spending for the same per-unit subsidy.

A subsidy paid administratively to producers is not necessarily retained by them. Its incidence is split through the changed market prices, and its fiscal cost is the full subsidy rectangle, not merely the consumer price fall.

Direct provision means government or a state agency supplies a good or service itself, financed wholly or partly through taxation, rather than relying only on private-market purchases. It is different from paying a private producer a subsidy.

| Rationale | Intended effect | Main limit |\n|---|---|---|\n| Public-good free riding | Collective finance enables provision | Government must estimate demand and socially useful quantity |\n| Merit-good under-consumption | Free or low-price access raises use | Excess demand, waiting lists or over-use may result |\n| Equity/essential access | Ability to pay matters less | Tax and opportunity costs; eligibility/rationing decisions remain |\n| Market power or weak private supply | Public capacity can increase supply or competition | Bureaucracy, weak incentives or crowding out private investment |

If public clinics provide vaccinations free at the point of use, the money price falls to zero for eligible users and demand may rise. The service has not become a public good: clinic appointments remain rival and can be rationed by waiting time, location or eligibility.

Judge success by access, quality, quantity and cost over time. Direct provision is stronger when the government can identify need and monitor outcomes; it is weaker when demand is hard to estimate, capacity is fixed or political incentives misallocate resources.

Free at the point of use does not mean free to society, unlimited or automatically allocatively efficient. Scarce labour, capital and tax revenue still have alternative uses.

A maximum price is binding only below equilibrium; a minimum price is binding only above equilibrium. A legal bound on the other side of equilibrium is non-binding and leaves the market outcome unchanged.

| Binding control | Immediate market result | Actual legal-market trades without extra government action | Likely effects |\n|---|---|---|---|\n| Maximum price below equilibrium | $Q_d>Q_s$ : shortage of $Q_d-Q_s$ | Limited to $Q_s$ | Some buyers pay less; queues, rationing, seller preference, quality decline or black markets; producer revenue/investment may fall |\n| Minimum price above equilibrium | $Q_s>Q_d$ : surplus of $Q_s-Q_d$ | Limited to $Q_d$ | Some sellers receive more; unsold stock, reduced consumption, possible government purchases or unemployment in a labour market |

Mark the legal price, read $Q_d$ and $Q_s$ at that same price, calculate the imbalance, then state who actually trades and how remaining demand or supply is allocated. Elastic demand or supply creates a larger quantity response to a given price gap; inelastic curves create a smaller one.

A ceiling can improve affordability only for consumers who obtain the good. A floor can support the income of sellers who still sell, or discourage a demerit good, but may exclude others. Outcomes depend on enforcement, duration, accompanying rationing/purchases and supply response over time.

Do not call quantity demanded the quantity sold under a shortage, or quantity supplied the quantity sold under a surplus. The short side of the legal market constrains trades unless government supplies, buys or otherwise intervenes.

A buffer stock scheme uses an agency's purchases and sales to keep a storable commodity price within a band, supporting a floor price in surplus years and a ceiling price in shortage years.

| Market pressure | Agency action at target price | Required quantity | Immediate effect |\n|---|---|---|---|\n| Bumper supply pushes price below the floor | Buy from the market | $Q_s-Q_d$ | Removes excess supply, builds stock and supports producer price/income |\n| Poor supply pushes price above the ceiling | Sell stored stock | $Q_d-Q_s$ | Fills excess demand, limits price rise and supports consumer access |

The scheme works across time: stock bought in plentiful periods must be stored and later released in scarce periods. Government purchase cost at a floor is target price multiplied by the quantity bought; sales replenish funds but need not cover storage, spoilage or administration.

| More likely to succeed | More likely to fail |\n|---|---|\n| Commodity is non-perishable and cheap to store | Stock spoils or storage is costly |\n| Price band reflects long-run demand and supply | Floor is persistently too high or ceiling too low |\n| Agency has sufficient finance, capacity and stock | Repeated surpluses exhaust funds or repeated shortages exhaust stock |\n| Shocks reverse over time | A permanent structural shift prevents stock balancing |

A buffer stock can reduce price and producer-income volatility, but cannot guarantee a fixed price indefinitely. Buying surplus transfers it into storage; it does not remove its resource, finance or disposal cost.

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.

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3.2 Methods and effects of government intervention in markets

Learning objectives

Trace a specific indirect tax and divide its incidence

Trace a producer subsidy and divide its benefit

Direct provision changes supply, access and allocation

Analyse binding maximum and minimum prices

Operate and evaluate a buffer stock scheme

Information provision can improve decisions when consumers lack relevant knowledge

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