A major burden for the takeoff of public-private collaboration is mutual distrust. Both the public and private sectors admit this, but at the same time, they agree that it will be difficult to reach national goals in such transcendental matters as housing, the energy and digital transition, and infrastructure, without the sum of both parts. All of this was confirmed during a conference on this subject organized by the Economy and Business Foundation, of the Association of Economists, and the Cerdà Institute.