74 Lastly, the amount of the pay must be adjusted to the public economic good. We have shown above how much it helps the common good for workers and other employees, by setting aside some part of their income which remains after necessary expenditures, to attain gradually to the possession of a moderate amount of wealth. But another point, scarcely less important, and especially vital in our times, must not be overlooked: namely, that the opportunity to work be provided to those who are able and willing to work. This opportunity depends largely on the wage and salary rate, which can help as long as it is kept within proper limits, but which on the other hand can be an obstacle if it exceeds these limits. For everyone knows that an excessive lowering of wages, or their increase beyond due measure, causes unemployment. This evil, indeed, especially as we see it prolonged and injuring so many during the years of Our Pontificate, has plunged workers into misery and temptations, ruined the prosperity of nations, and put in jeopardy the public order, peace, and tranquillity of the whole world. Hence it is contrary to social justice when, for the sake of personal gain and without regard for the common good, wages and salaries are excessively lowered or raised; and this same social justice demands that wages and salaries be so managed, through agreement of plans and wills, in so far as can be done, as to offer to the greatest possible number the opportunity of getting work and obtaining suitable means of livelihood.
Source: Quadragesimo Anno (Vatican.va)