Mater et Magistra §44

⁴⁴ On the subject of work, Pius XII repeated the teaching of the Leonine encyclical, maintaining that a man's work is at once his duty and his right. It is for individuals, therefore, to regulate their mutual relations where their work is concerned. If they cannot do so, or will not do so, then, and only then, does "it fall back on the State to intervene in the division and distribution of work, and this must be according to the form and measure that the common good properly understood demands." (21)