“You cannot simultaneously have free immigration and a welfare state. ... I am in favor of the unilateral reduction of tariffs, but the movement of goods is a substitute for the movement of people. As long as you have a welfare state, I do not believe you can have a unilateral open immigration. I would like to see a world in which you could have open immigration, but stop kidding yourselves. On the other hand, the welfare state does not prevent unilateral free trade. I believe that they are in different categories.”