Mater et Magistra §76

⁷⁶ We should recall here the principle enunciated by Pius XI in Quadragesimo Anno : "It is entirely false to ascribe to the property alone or to the work alone whatever has been obtained through the combined effort of both, and it is wholly unjust for either, denying the efficacy of the other, to arrogate to itself whatever has been produced." (28)