In addition to the tasks of harmonizing and guiding development, in exceptional circumstances the State can also exercise a substitute function, when social sectors or business systems are too weak or are just getting under way, and are not equal to the task at hand. Such supplementary interventions, which are justified by urgent reasons touching the common good, must be as brief as possible, so as to avoid removing permanently from society and business systems the functions which are properly theirs, and so as to avoid enlarging excessively the sphere of State intervention to the detriment of both economic and civil freedom.
In recent years the range of such intervention has vastly expanded, to the point of creating a new type of State, the so-called “Welfare State”. This has happened in some countries in order to respond better to many needs and demands, by remedying forms of poverty and deprivation unworthy of the human person. However, excesses and abuses, especially in recent years, have provoked very harsh criticisms of the Welfare State, dubbed the “Social Assistance State”. Malfunctions and defects in the Social Assistance State are the result of an inadequate understanding of the tasks proper to the State. Here again the principle of subsidiarity must be respected: a community of a higher order should not interfere in the internal life of a community of a lower order, depriving the latter of its functions, but rather should support it in case of need and help to coordinate its activity with the activities of the rest of society, always with a view to the common good.