Populorum progressio is an encyclical written by Pope Paul VI on the topic of "the development of peoples" and that the economy of the world should serve mankind and not just the few. It was released on 26 March 1967.
It touches on a variety of principles of Catholic social teaching such as the right to a just wage; the right to security of employment; the right to fair and reasonable working conditions; the right to join a union; and the universal destination of resources and goods.