Because it is one thing to have free immigration to jobs. It is another thing to have free immigration to welfare. And you cannot have both. If you have a welfare state, if you have a state in which every resident is promises a certain minimal level of income, or a minimum level of subsistence, regardless of whether he works or not, produces it or not. Then it really is an impossible thing.
Milton FriedmanViewed as a means to the end of political freedom, economic arrangements are important because of their effect on the concentration or dispersion of power. The kind of economic organization that provides economic freedom directly, namely, competitive capitalism, also promotes political freedom because it separates economic power from political power and in this way enables the one to offset the other
Milton FriedmanA private enterprise system needs some measuring rod, it needs something, it needs money to make its transactions. You can't run a big complicated system through barter, through converting one commodity into another. You need a monetary system to operate. And the instability in that monetary system is devastating to the performance of the economy.
Milton FriedmanAs a nation, we have been responsible for the murder of literally hundreds of thousands of people at home and abroad by fighting a war that should never have been started and can be won, if at all, only by converting the United States into a police state.
Milton Friedman