Quadragesimo Anno §100

¹⁰⁰ That, in the first place, the whole aspect of economic life is vastly altered, is plain to all. You know, Venerable Brethren and Beloved Children, that the Encyclical of Our Predecessor of happy memory had in view chiefly that economic system, wherein, generally, some provide capital while others provide labor for a joint economic activity. And in a happy phrase he described it thus: "Neither capital can do without labor, nor labor without capital."