Subsidiarity is an organizing principle of decentralisation, stating that a matter ought to be handled by the smallest, lowest, or least centralised authority capable of addressing that matter effectively. The Oxford English Dictionary defines subsidiarity as the idea that a central authority should have a subsidiary function, performing only those tasks which cannot be performed effectively at a more immediate or local level. The concept is applicable in the fields of government, political science, neuropsychology, cybernetics, management and in military command (Mission Command). In political theory, subsidiarity is sometimes viewed as a principle entailed by the idea of federalism.
According to the Oxford English Dictionary, the term "subsidiarity" in English follows the "German usage Subsidiarität (1809 or earlier in legal use; 1931 in the context of Catholic social doctrine, in §80 of Rundschreiben über die gesellschaftliche Ordnung, the German version of Pope Pius XI's encyclical Quadragesimo Anno (1931))". More distantly, it is derived from the Latin verb subsidio (to aid or help), and the related noun subsidium (aid or assistance). The concept as discussed here was first described formally in Catholic social teaching.
Alexis de Tocqueville's classic study, Democracy in America, may be viewed as an examination of the operation of the principle of subsidiarity in early 19th century America. De Tocqueville noted that the French Revolution began with "a push towards decentralization...in the end, an extension of centralization." And he wrote that "Decentralization has, not only an administrative value, but also a civic dimension, since it increases the opportunities for citizens to take interest in public affairs; it makes them get accustomed to using freedom. And from the accumulation of these local, active, persnickety freedoms, is born the most efficient counterweight against the claims of the central government, even if it were supported by an impersonal, collective will."
Will the American people never learn that, as a principle, to expect swift response and efficiency from government is fatuous? Will we never heed the principle of subsidiarity (in which our fathers were bred), namely that no public agency should do what a private agency can do better, and that no higher-level public agency should attempt to do what a lower-level agency can do better – that to the degree the principle of subsidiarity is violated, first local government, the state government, and then federal government wax in inefficiency? Moreover, the more powers that are invested in government, and the more powers that are wielded by government, the less well does government discharge its primary responsibilities, which are (1) defence of the commonwealth, (2) protection of the rights of citizens, and (3) support of just order.
The United Nations Development Programme's 1999 report on decentralisation noted that subsidiarity was an important principle. It quoted one definition:
Decentralization, or decentralising governance, refers to the restructuring or reorganisation of authority so that there is a system of co-responsibility between institutions of governance at the central, regional and local levels according to the principle of subsidiarity, thus increasing the overall quality and effectiveness of the system of governance, while increasing the authority and capacities of sub-national levels. 
According to Richard Macrory, the positive effects of a political/economic system governed by the principle of subsidiarity include:
- Systemic failures of the type seen in the crash of 2007/8 can largely be avoided, since diverse solutions to common problems avoid common mode failure.
- Individual and group initiative is given maximum scope to solve problems.
- The systemic problem of moral hazard is largely avoided. In particular, the vexing problem of atrophied local initiative/responsibility is avoided.
He writes that the negative effects of a political/economic system governed by the principle of subsidiarity include:
- When a genuine principle of liberty is recognised by a higher political entity but not all subsidiary entities, implementation of that principle can be delayed at the more local level.
- When a genuinely efficacious economic principle is recognised by a higher political entity, but not all subsidiary entities, implementation of that principle can be delayed at the more local level.
- In areas where the local use of common resources has a broad regional, or even global, impact (such as in the generation of pollutants), higher levels of authority may have a natural mandate to supersede local authority.
General principle of European Union law
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Subsidiarity is perhaps presently best known as a general principle of European Union law. According to this principle, the EU may only act (i.e. make laws) where action of individual countries is insufficient. The principle was established in the 1992 Treaty of Maastricht. However, at the local level it was already a key element of the European Charter of Local Self-Government, an instrument of the Council of Europe promulgated in 1985 (see Article 4, Paragraph 3 of the Charter) (which states that the exercise of public responsibilities should be decentralised). Subsidiarity is related in concept to, but should not be confused with, the concept of a Margin of appreciation.
Subsidiarity was established in EU law by the Treaty of Maastricht, which was signed on 7 February 1992 and entered into force on 1 November 1993. The present formulation is contained in Article 5(3) of the Treaty on European Union (consolidated version following the Treaty of Lisbon, which entered into force on 1 December 2009):
Under the principle of subsidiarity, in areas which do not fall within 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, either at central level or at regional and local level, but can rather, by reason of the scale or effects of the proposed action, be better achieved at Union level.
Court of Justice
The Court of Justice of the European Union in Luxembourg is the authority that has to decide whether a regulation falls within the exclusive competence of the Union. As the concept of subsidiarity has a political as well as a legal dimension, the Court of Justice has a reserved attitude toward judging whether EU legislation is consistent with the concept. The Court will examine only marginally whether the principle is fulfilled. A detailed explanation of the legislation is not required; it is enough that the EU institutions explain why national legislation seems inadequate and that Union law has an added value.
An example is the judgement of the Court of Justice of the European Union in a legal action taken by the Federal Republic of Germany against the European Parliament and the Council of the European Union concerning a Directive on deposit guarantee schemes (13 May 1997). Germany argued that the Directive did not explain how it was compatible with the principle of subsidiarity. The Court answered:
- In the present case, the Parliament and the Council stated in the second recital in the preamble to the Directive that ‘consideration should be given to the situation which might arise if deposits in a credit institution that has branches in other Member States became unavailable’ and that it was ‘indispensable to ensure a harmonised minimum level of deposit protection wherever deposits are located in the Community’. This shows that, in the Community legislature’s view, the aim of its action could, because of the dimensions of the intended action, be best achieved at Community level. (…)
- Furthermore, in the fifth recital the Parliament and the Council stated that the action taken by the Member States in response to the Commission's Recommendation has not fully achieved the desired result. The Community legislature therefore found that the objective of its action could not be achieved sufficiently by the Member States.
- Consequently, it is apparent that, on any view, the Parliament and the Council did explain why they considered that their action was in conformity with the principle of subsidiarity and, accordingly, that they complied with the obligation to give reasons as required under Article 190 of the Treaty. An express reference to that principle cannot be required.
- On those grounds, the plea of infringement of the obligation to state reasons is unfounded in fact and must therefore be rejected. (Case C-233/94)
- Cellular democracy
- Foundation for subsidiarity
- Grassroots democracy
- Local Government
- Localism (politics)
- Margin of appreciation
- Oswald von Nell-Breuning
- Principle of conferral
- Public choice theory
- States' rights
- Subsidiarity (Catholicism)
- Urban secession
- Das Subsidiaritätsprinzip als wirtschaftliches Ordnungsprinzip, in: Wirtschaftliche Entwicklung und soziale Ordnung. Degenfeld-Festschrift, pub. von Lagler and J. Messner, Vienna 1952, pp81-92, cited in http://www.helmut-zenz.de/hznellbr.html
- Vivien A. Schmidt, Democratizing France: The Political and Administrative History of Decentralization, p. 10.
- A History of Decentralization, Earth Institute of Columbia University, accessed 4 February 2013
- Reid Buckley, An American Family – The Buckleys, Simon & Schuster, 2008, p. 177.
- Decentralization: A Sampling of Definitions, Joint UNDP (United Nations Development Programme)-Government of Germany evaluation of the UNDP role in decentralization and local governance, at the United Nations Development Programme website, October 1999, p. 2, 16, 26.
- Macrory, Richard, 2008, Regulation, Enforcement and Governance in Environmental Law, Cameron May, London, p. 657.
- Shelton, Dinah. The Boundaries of Human Rights Jurisdiction in Europe. Duke J. Comp. & Int'l L. 153. 2003.
- Protocol 2 to the European Treaties.
- Judgment Of The Court in Case C-233/94
|Look up subsidiarity in Wiktionary, the free dictionary.|
- Treaty establishing the European Community.
- The Assembly of European Regions' Subsidiarity is a word movement, demanding recognition in dictionaries worldwide
- For German-speaking visitors: see also Subsidiaritaet in the Lexikon der sozialoekologischen Marktwirtschaft.