Mater et Magistra §54

⁵⁴ The present advance in scientific knowledge and productive technology clearly puts it within the power of the public authority to a much greater degree than ever before to reduce imbalances which may exist between different branches of the economy or between different regions within the same country or even between the different peoples of the world. It also puts into the hands of public authority a greater means for limiting fluctuations in the economy and for providing effective measures to prevent the recurrence of mass unemployment. Hence the insistent demands on those in authority—since they are responsible for the common good—to increase the degree and scope of their activities in the economic sphere, and to devise ways and means and set the necessary machinery in motion for the attainment of this end.