What Do You Get For Your Taxes? Public Goods and Services (GERMANY)

The Economics of Public Goods#

Not every good or service can be efficiently provided by private markets. Economists distinguish goods along two dimensions that determine whether markets work well or fail:

The Two Axes#

1. Excludability: Can a provider prevent people who haven't paid from using the good?

• Excludable: A cinema can check tickets. A subscription software requires a license.
• Non-excludable: A lighthouse benefits all ships regardless of payment. National defense protects all residents.

2. Rivalry: Dös one person's use reduce availability for others?

• Rival: A slice of pizza eaten by one person cannot be eaten by another.
• Non-rival: One person watching a public fireworks display dös not reduce anyone else's enjoyment.

Four Categories of Goods#

Why Markets Underprovide Public Goods: The Free-Rider Problem#

Pure public goods suffer from a structural market failure. Because non-excludable goods cannot be withheld from those who don't pay, rational actors have an incentive to free-ride — to enjoy the good without contributing to its cost, hoping others will pay.

In a private market for, say, national flood defense:

• Individual A knows that if neighbors fund it, they benefit too — so why pay?
• Individual B reasons the same way.
• Result: the good is underfunded or not provided at all, even though everyone would benefit from it.

This logic was formalized by economist Paul Samuelson in his landmark 1954 paper The Pure Theory of Public Expenditure (Review of Economics and Statistics). Samuelson proved mathematically that the market equilibrium for public goods is inefficient and that government provision (financed by taxation) can produce a Pareto improvement.

Real-World Complications: Mixed Goods#

Most real-world public goods are impure — somewhere on the spectrum. Roads are non-excludable and largely non-rival when empty, but become rival during rush hour congestion. This is why economists distinguish:

• Pure public good: National defense, basic scientific research, diplomatic corps.
• Quasi-public goods: Primary education, public health infrastructure, flood control. Largely non-excludable in practice (it would be impractical or ethically unacceptable to exclude some children from schools), though private provision is theoretically possible.
• Merit goods: Goods society judges should be provided regardless of ability to pay (healthcare, education). The justification is partly paternalistic and partly based on positive externalities — educated, healthy citizens benefit the whole economy.

The Role of Externalities#

Even for excludable goods, markets may underprovide when positive externalities exist. Vaccination is a classic example: the private benefit (you don't get sick) is smaller than the social benefit (you also don't infect others — herd immunity). Without government subsidy or mandate, individuals underinvest in vaccination from society's perspective.

This externality argument, developed by Arthur Pigou (The Economics of Welfare, 1920), provides the theoretical foundation for government subsidies, mandates, and public provision of goods like basic research, infrastructure, and preventive healthcare.

Implications for Taxation#

Because public goods cannot be efficiently funded by voluntary payment, taxation serves as the compulsory mechanism to collect contributions proportional to income or consumption. Without this compulsion, the free-rider problem would prevent adequate funding of goods that nearly everyone values — defense, courts, roads, public health.