Catechism of the Catholic Church §2434 — excerpt
A just wage is the legitimate fruit of work. To refuse or withhold it can be a grave injustice. In determining fair pay both the needs and the contributions of each person must be taken into account.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: GS 67 # 2