http://en.wikipedia.org/wiki/Subsidiarity
Subsidiarity is the principle that matters ought to be handled by the smallest (or, the lowest) competent authority. 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, cybernetics and management. Subsidiarity is, ideally or in principle, one of the features of federalism.
The word subsidiarity is derived from the Latin word subsidiarius and has its origins in Catholic social teaching. The concept or principle is found in several constitutions around the world (see for example the Tenth Amendment to the United States Constitution).
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Catholic social teaching
The principle of subsidiarity holds that government should undertake only those initiatives which exceed the capacity of individuals or private groups acting independently. The principle is based upon the autonomy and dignity of the human individual, and holds that all other forms of society, from the family to the state and the international order, should be in the service of the human person. Subsidiarity assumes that these human persons are by their nature social beings, and emphasizes the importance of small and intermediate-sized communities or institutions, like the family, the church, and voluntary associations, as mediating structures which empower individual action and link the individual to society as a whole. "Positive subsidiarity", which is the ethical imperative for communal, institutional or governmental action to create the social conditions necessary to the full development of the individual, such as the right to work, decent housing, health care, etc., is another important aspect of the subsidiarity principle.
The principle of subsidiarity was developed in the encyclical Rerum Novarum of 1892 by Pope Leo XIII, as an attempt to articulate a middle course between the excesses of laissez-faire capitalism on the one hand and the various forms of communism, which subordinate the individual to the state, on the other. The principle was further developed in Pope Pius XI's encyclical Quadragesimo Anno of 1931, and Economic Justice for All by the United States Conference of Catholic Bishops.
