Subsidiarity is usually presented as a preference for decisions being taken “closer to the citizen”. That is too vague to be useful.
A stronger version is operational:
Place a decision at the smallest political level that has enough capacity to handle it while internalising the material costs, benefits and spillovers of that decision.
This is not a doctrine that says local is always better. Sometimes the correct unit is a neighbourhood. Sometimes it is a city, a region, a country or a group of countries. The point is to make scale a function of the problem, rather than assuming in advance that one level of government should own the whole policy domain.
The European Union already contains a formal version of this logic. Article 5 of the Treaty on European Union says that, in areas outside exclusive EU competence, the Union should act only where objectives cannot be sufficiently achieved by Member States at central, regional or local level and can be better achieved at Union level because of the scale or effects of the proposed action. Protocol No. 2 requires legislative proposals to justify subsidiarity and proportionality and to consider financial and administrative effects.
The interesting question is not whether the word appears in a treaty. It is whether subsidiarity can work as a repeatable institutional test.
Key takeaways
- Subsidiarity is an allocation rule, not a slogan. The relevant question is which level can handle the problem and its spillovers with sufficient capacity.
- The smallest level is not automatically the best level. Economies of scale, externalities and thin administrative capacity can justify moving a function upward.
- Good subsidiarity is reversible. If a higher level acquires power because a problem crosses borders, that does not mean every adjacent function must be centralised permanently.
A five-part subsidiarity test
A workable test can be built around five questions.
1. How far do the effects travel?
The first question is the radius of the externality.
A badly maintained local street primarily affects a locality. Air pollution from an industrial region may cross several administrative borders. A contagious disease, a cross-border river system or a military threat can create effects far beyond the place where the first decision is made.
The further the material spillover travels, the stronger the case for coordination at a wider level.
But the logic should remain precise. A cross-border externality in one part of a policy does not automatically justify central control of the entire domain.
Centralise the externality, not the whole policy domain.
A river may require basin-wide pollution standards without requiring one authority to run every municipality’s water service. Air defence can require national or allied coordination without making local land-use policy a defence competence.
2. Are there real economies of scale?
Some public functions carry high fixed costs.
Cybersecurity expertise, advanced medical systems, major transport infrastructure, defence procurement and specialist financial supervision can be difficult for very small units to reproduce independently. OECD work on decentralisation repeatedly emphasises that responsibilities should be matched with adequate resources and administrative capacity.
The presence of scale economies creates a legitimate case for pooling.
Pooling, however, is not the same as monopoly. Several jurisdictions can jointly finance a laboratory, court, procurement body or transport network while retaining autonomy in other decisions.
The institutional question is therefore not simply “local or central?” It is also:
Can capacity be shared without transferring the whole competence?
3. How different are local preferences and conditions?
Uniform rules are most costly when circumstances differ materially.
Housing, schools, local transport, urban design, licensing intensity and many public services depend heavily on geography, density, culture and local economic structure. When preferences and conditions diverge, decentralisation creates room for different solutions.
It also creates information. One municipality can learn from another. A successful regional process can be copied without forcing every jurisdiction to adopt the experiment before it has been tested.
Elinor Ostrom’s work on polycentric systems is important here because it rejects the assumption that complex collective-action problems require one monocentric authority. Multiple centres can coexist, coordinate and learn, provided their responsibilities and interactions are designed coherently.
4. Does the lower level have real capacity?
Subsidiarity without capacity becomes abandonment.
A municipality cannot be made responsible for a technically complex function and then denied the revenue, staff, data or legal powers required to perform it. A region that formally “decides” policy but merely executes centrally written rules is not meaningfully autonomous either.
This is where decentralisation debates often become confused. Delegation is not the same as decentralisation.
The relevant tests are practical:
- Does the lower level have its own decision right?
- Does it control sufficient resources?
- Can it hire or access the necessary expertise?
- Is responsibility visible to citizens?
- Can it change the policy, or only administer it?
5. Can the allocation be reversed?
Institutional mistakes are unavoidable. A robust system should make them correctable.
If a function is moved upward during a crisis, there should be a way to ask later whether the broader competence is still necessary. If a local function generates harmful cross-border spillovers, there should be a way to coordinate more widely without treating centralisation as irreversible.
Reversibility turns constitutional design into a discovery process.
Without it, every temporary reason for scale becomes a permanent argument for accumulated power.
What the EU gets right in principle
The EU’s formal subsidiarity rule contains the right intellectual structure: compare lower-level capacity with the scale and effects of the objective.
Protocol No. 2 adds a useful discipline. Draft legislation should contain enough detail to assess compliance with subsidiarity and proportionality; it should consider financial impact and, where possible, qualitative and quantitative indicators. National parliaments can also issue reasoned opinions on subsidiarity.
Those are useful design features because they force a central institution to articulate why a higher level is necessary.
The limitation is equally instructive: a procedural test can become weak if the burden of proof is too easy to satisfy, if policy categories are drawn broadly or if powers accumulate faster than they return.
That is not an argument that every EU competence is misplaced. It is an argument for making subsidiarity more falsifiable.
A serious justification should answer:
- What precise cross-border problem exists?
- Why can lower levels not solve it adequately?
- Why would mutual recognition or coordination be insufficient?
- What new power is actually necessary?
- How will the competence be reviewed or returned if the justification disappears?
The strongest objection: fragmentation has costs
The best case against aggressive subsidiarity is not ideological. It is operational.
Too many decision centres can create duplicated administration, inconsistent standards, legal uncertainty and barriers to scale. A company operating across twenty jurisdictions may face twenty licences, twenty reporting systems and twenty interpretations of the same activity. Local political systems can also be captured by dominant employers, families or professional groups.
Central rules can sometimes increase freedom by removing local barriers.
A common market rule that stops protectionist discrimination can enlarge choice. A shared technical standard can reduce needless duplication. A higher court can protect individual rights against local abuse.
This is why “centralisation bad” is not a subsidiarity principle.
The real choice is between different allocations of authority, each carrying information, coordination, capture and scale costs.
Four variables that should not be confused
Subsidiarity is primarily about decentralisation: which level owns a decision.
It is not the same as size. A large country can allocate substantial power to states, cantons or regions. A small country can centralise almost everything.
It is not the same as openness. A decentralised system can still erect trade or migration barriers, while a more centralised state can be highly open internationally.
And it is not the same as exit. Exit is an ex-post discipline: what alternatives remain when a person or company rejects the policy package. Subsidiarity is an ex-ante design question: where should the authority sit in the first place?
The strongest institutional systems use all four dimensions deliberately.
The practical consequence: authority must be mapped before advice is useful
International activity makes the subsidiarity problem concrete.
A founder may deal simultaneously with a municipality, a regional authority, a national tax administration, a free-zone or sector regulator, a central bank and supranational rules. The same business can face one level for immigration, another for corporate tax, another for licensing and another for data or consumer rules.
The operational question is not whether the system is “centralised” in the abstract.
It is:
Who actually has the legal power to decide this issue?
That is why jurisdictional planning starts with a map of competences, not a political preference for one scale.
Subsidiarity is valuable when it keeps power close enough to learn, large enough to solve the real problem and limited enough to return when the problem changes.
That makes it less a slogan about localism than an institutional technology for choosing scale.
Sources
- EUR-Lex — Article 5, Treaty on European Union
- EUR-Lex — Protocol No. 2 on the application of the principles of subsidiarity and proportionality
- OECD — Making Decentralisation Work: A Handbook for Policy-Makers
- Elinor Ostrom — “Polycentric Systems for Coping with Collective Action and Global Environmental Change”
Disclaimer
This article is general institutional and political commentary. Subsidiarity does not provide a universal legal answer to the allocation of powers, and actual competences depend on the applicable constitution, treaties, statutes and regulatory framework. It is not legal, tax or political advice.
