The proponents of a living wage is the Catholic Church and the teachings of the Magesterium:
*2434 A just wage is the legitimate fruit of work. To refuse or withhold it can be a grave injustice.221 In determining fair pay both the needs and the contributions of each person must be taken into account. "Remuneration for work should guarantee man the opportunity to provide a dignified livelihood for himself and his family on the material, social, cultural and spiritual level, taking into account the role and the productivity of each, the state of the business, and the common good."222 Agreement between the parties is not sufficient to justify morally the amount to be received in wages. *
Society must pursue economic justice and the economy must serve people, not the other way around. Employers must not “look upon their work people as their bondsmen, but … respect in every man his dignity as a person ennobled by Christian character.”[44] Employers contribute to the common good through the services or products they provide and by creating jobs that uphold the dignity and rights of workers.
Workers have a right to work, to earn a living wage, and to form trade unions[45] to protect their interests. All workers have a right to productive work, to decent and fair wages, and to safe working conditions.[46] Workers also have responsibilities—to provide a fair day’s work for a fair day’s pay, to treat employers and co-workers with respect, and to carry out their work in ways that contribute to the common good. Workers must “fully and faithfully” perform the work they have agreed to do. Rerum Novarum, Pope Leo XIII
Peace,
David