 The philosopher Robert Nozick in the final chapter of his classic work, Anarchy, State and Utopia, argued that libertarianism is not itself a vision of utopia, but is instead a utopia of utopias, a framework for utopias. What he meant by that is that the minimal state, by limiting itself to protecting our basic rights, provides a framework in which all of us as individuals and in groups can pursue the kinds of lives that we find meaningful. So if the kind of life that I find meaningful as a socialist life is one where my property is shared communally and the community decides economic choices for all of us, then I'm free to go and pursue that as long as it's voluntary. Under socialism, on the other hand, where this one economic system, communal ownership of property, is imposed from the top down, no one has a choice. And so those of us who are free marketers under socialism can't go and start a free market community within that state. Those of us who disagree with socialism are stuck. So when a state founded on principles of liberty under libertarianism, you can have voluntary socialism, but under socialism you cannot have liberty.