Subsidiarity

Subsidiarity answers a recurring design question: when several levels of authority could act (household, association, municipality, region, state, union), which should? The principle sets a presumption in favour of the smallest or closest unit and requires larger units to justify their intervention. Higher levels are subsidiary in the original Latin sense of subsidium, help: they exist to support lower levels, not to replace them.

The principle has two sides that are often forgotten. The negative side forbids higher authorities from absorbing tasks that lower ones can perform. The positive side obliges higher authorities to help when lower ones cannot cope, which can justify central action as well as limit it.

Origins

Elements of the idea appear in Aristotle's account of the household, village and polis, and in Johannes Althusius's Politica (1603), which described political order as a nested federation of consociations. The modern formulation comes from Catholic social teaching. In the encyclical Quadragesimo Anno (1931), Pius XI declared it an injustice and a disturbance of right order to assign to a greater and higher association what lesser and subordinate organisations can do, adding that social activity should help the members of the social body and never destroy or absorb them.

Liberal, federal and communitarian readings

Andreas Føllesdal's survey distinguishes several justifications: protecting individual liberty and the associations of civil society from the state; improving efficiency by matching decisions to the scale of their effects (an idea close to fiscal federalism and the Tiebout model); enhancing democratic participation by keeping decisions near those affected; and respecting the identity of communities. Each reading supports a different allocation of powers, and they can conflict.

Subsidiarity in EU law

The Maastricht Treaty (1992) made subsidiarity a general principle of European Community law. Article 5(3) of the Treaty on European Union now provides that, in areas outside its exclusive competence, the Union shall act only if and in so far as the objectives of the proposed action cannot be sufficiently achieved by the member states, at central, regional or local level, but can rather, by reason of scale or effects, be better achieved at Union level.

Protocol No 2 gives national parliaments an early-warning mechanism. Each parliament has two votes and eight weeks to send a reasoned opinion on a draft act. If opinions represent at least one third of the votes (one quarter for justice and home affairs), the Commission must review the proposal (the "yellow card"); a simple majority under the ordinary legislative procedure triggers a stronger "orange card" procedure. The Court of Justice can annul acts that breach subsidiarity, although it has so far given the institutions wide discretion.

Polycentric governance

Elinor and Vincent Ostrom's work on polycentricity reaches a similar conclusion by a different route: overlapping centres of decision at multiple scales tend to fit local conditions better, and Elinor Ostrom's design principles for commons include "nested enterprises" for larger systems. Subsidiarity can be read as the normative counterpart of that empirical finding.

• The EU yellow card: the threshold has been reached three times. In 2012, on the "Monti II" proposal on the right to take collective action, the Commission withdrew the proposal while maintaining that it complied with subsidiarity. In 2013, on the European Public Prosecutor's Office, and in 2016, on the revision of the Posting of Workers Directive, the Commission maintained its proposals. The orange card has never been triggered.
• Local self-government: the Council of Europe's European Charter of Local Self-Government (1985) states that public responsibilities shall generally be exercised, in preference, by the authorities closest to the citizen.
• Swiss federalism: cantons and communes keep wide powers over taxation, education and naturalisation, with federal action requiring constitutional authorisation, often approved by referendum.
• Participatory budgeting and neighbourhood councils apply subsidiarity at the city scale by devolving spending choices to districts.
• Commons governance: irrigation systems, fisheries and forests studied by Ostrom often work best when local users set rules within a framework set by higher authorities.

• Indeterminacy: the principle does not say which level is "able" to act; that depends on contested judgements about efficiency, externalities and values. Critics call it a procedural slogan rather than a rule.
• Weak enforcement: the EU's yellow card has rarely been triggered and the Commission has usually maintained its proposals; the Court of Justice has not annulled an act solely for breach of subsidiarity.
• Centralising use: because the positive side justifies central help, subsidiarity can legitimise expansion of central powers whenever local units are said to be inadequate.
• Local domination: smaller units are not automatically more democratic; local majorities can oppress minorities, and decentralisation can entrench local elites or create a race to the bottom.
• Collective-action problems: climate change, pandemics and financial stability involve externalities that local units cannot internalise, so a strong presumption for the local can delay necessary action.

Subsidiarity is widely accepted as a principle and weakly binding as a rule. Its real effects come less from courts than from procedures that force higher levels to justify their action and give lower levels a voice, such as the EU early-warning mechanism or constitutional lists of local competences. Designers of federations, city networks and digital platforms can borrow its two-sided structure: a default of local autonomy combined with an explicit obligation for higher levels to help when local capacity fails.

• Andreas Føllesdal, "Survey Article: Subsidiarity" (1998)
• Treaty on European Union, Article 5
• Protocol No 2 on subsidiarity and proportionality
• European Commission, "Subsidiarity control mechanism"
• Pius XI, Quadragesimo Anno (1931)