Mater et Magistra §150

¹⁵⁰ Among citizens of the same political community there is often a marked degree of economic and social inequality. The main reason for this is the fact that they are living and working in different areas, some of which are more economically developed than others. Where this situation obtains, justice and equity demand that public authority try to eliminate or reduce such imbalances. It should ensure that the less developed areas receive such essential public services as their circumstances require, in order to bring the standard of living in these areas into line with the national average. Furthermore, a suitable economic and social policy must be devised which will take into account the supply of labor, the drift of population, wages, taxes, credit, and the investing of money, especially in expanding industries. In short, it should be a policy designed to promote useful employment, enterprising initiative, and the exploitation of local resources.