117 And so, in the first place, every effort must be made to bring about that which Our predecessor Leo Xlll, of happy memory, has already insisted upon, namely, that in the State such economic and social methods should be adopted as will enable every head of a family to earn as much as, according to his station in life, is necessary for himself, his wife, and for the rearing of his children, for "the laborer is worthy of his hire." To deny this, or to make light of what is equitable, is a grave injustice and is placed among the greatest sins by Holy Writ; nor is it lawful to fix such a scanty wage as will be insufficient for the upkeep of the family in the circumstances in which it is placed.
Source: Casti Connubii (Vatican.va)