The above principles are valid always and everywhere. So much is clear. But their degree of applicability to concrete cases cannot be deter mined without reference to the quantity and quality of available resources; and these can—and in fact do—vary from country to country, and even, from time to time, within the same country.
In view of the rapid expansion of national economies, particularly since the war, there is one very important social principle to which We would draw your attention. It is this: Economic progress must be accompanied by a corresponding social progress, so that all classes of citizens can participate in the increased productivity. The utmost vigilance and effort is needed to ensure that social inequalities, so far from increasing, are reduced to a minimum.