Catechism of the Catholic Church §2431 — excerpt
The responsibility of the state. "Economic activity, especially the activity of a market economy, cannot be conducted in an institutional, juridical, or political vacuum. On the contrary, it presupposes sure guarantees of individual freedom and private property, as well as a stable currency and efficient public services.
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: CA 48